C语言编程-题库

C语言编程题库1、用选择法对n个数由小到大排序。#include<stdio.h>voidmain()(inta[100],n,i,j,t;scanf("%d",&n);for(i=0;i<n;i++)scanf("%d",&a[i]);for(i=l;i<n;i++)for(j=i;j<n;j++)if(a[i-l]>aU]){t=a[i-l];a[i-l]=a[j];a[j]=t;}for(i=0;i<n;i++)printf("%d",a[i]);printf("\n");}2、将键盘输入的12个数据存放到ー个4行3列的二维数组中,分别求出各行、各列以及表中所有数之和。#include<stdio.h>voidmain()(inta[5][4]={0},i,j;for(i=0;i<4;i++)for(j=0;j<3;j++)scanf("%d",&a[i][j]);for(i=0;i<4;i++)for(j=0;j<3;j++){a[i][3]+=a[i][j];a[4][j]+=a[i][j];a[4][3]+=a[i][j];}for(i=0;i<5;i++){for(j=0;j<4;j++)printf("%d\t",a[i][j]);printf("\n");)}3、判断一个字符串是否为回文串(回文串指正读反读都一样的字符串,如:字符串"abcl21cba")o#include<stdio.h>#include<string.h>voidmain()chara[30],b[30];inti,j;scanf("%s，a);i=strlen(a)-l;j=0；while(i>=0)bO++]=a[H;bO]='\0';if(strcmp(a,b)==O)printf(H%s是ー个回文串'nツa);elseprintf(n%s不是ー个回文串、n”,a);)#include<stdio.h>#include<string.h>voidmain()(chara[30];intij;scanf("%s”,a);i=strlen(a)-l;j=0；while(i>j)if(a[i—]!=a[j++])break;if(i<=j)printf(H%s是ー个回文串'nツa);elseprintf(n%s不是ー个回文串、n”,a);}4、输出杨辉三角形的前10行。。#include<stdio.h>voidmain()(inta[10][10]Jj;for(i=0;i<10;i++)a[i][0]=a[i][i]=l;for(i=2;i<10;i++)for(j=l;j<i;j++)a[i]U]=a[i-l][j]+a[i-l][j-l];for(i=0;i<10;i++){for(j=0;j<=i;j++)printf("％d't”,a。皿);printf("\n")；)}5、把输入的十进制数以十六进制数的形式输出。#include<stdio.h>voidmain()(inta[100],x,i=0;scanf(”%d”,&x);while(x){a[i++]=x%16;x/=16;}i-;while(i>=0)(if(a[i]>9)printfC^c'VA'+aliJ-lO);elseprintf(”%d”,a[i]);i一;)printf("\n");)6、删去ー维数组中所有相同的数,使之只剩ー个。数组中的数已按由小到大的顺序排列,函数返回删除后数组中数据的个数。例如,若一维数组中的数据是: 2223445666677899101010 删除后，数组中的内容应该是: 2345678910c#include<stdio.h>voidmain()(inta[19]={2,2,2,3,4,4,5,6,6,6,6,7,7,8,9,9,10,10,10},n,i,j;n=19;for(i=17;i>=0;i-)if(a[i]==a[i+l])(for(j=i+l;j<n;j++)aO-l]=a[j];n-；)for(i=0;i<n;i++)printf(”％d、ピ,a[i]);printf("\n");7、求一个3*3矩阵对角线元素之和。#include<stdio.h>voidmain()(inta[3][3]/ij/sum=0;for(i=0;i<3;i++)for(j=0;j<3;j++)scanf("%d"z&a[i][j]);for(i=0;i<3;i++)sum+=a「巾];〃两条对角线sum+=a[i][i]+a[i][2-i]pnntf("%d\n"zsum);printf("\n")；}8、给定一个ー维数组,将数组中所有指定值x全部删除,输出删除后内容。#include<stdio.h>voidmain(){inta[10]/x/n=10JJ;for(i=0;i<10;i++)scanf("%d，&a[i]);scanf("％d”,&x);for(i=9;i>=0;i-)if(a[i]==x)(for(j=i+l;j<n;j++)aD-l]=a[j];n一；)for(i=0;i<n;i++)printf(M%d\t",a[i]);printf("\n");}9、输入一个十进制整数,将其转换为R进制输出(R值为2.16)。#include<stdio.h>voidmain()(inta[100],x,r,i=0;scanf(“%d,%d“,&x,&r);while(x){a[i++]=x%r;x/=r;}i-;while(i>=0)if(a[i]>9)printf("%c"；A'+a[i]-10);elseprintf(”%d”,a[i]);i一;)printf("\n");)不使用strcmp函数,编程实现2个字符串的比较。ッ#include<stdio.h>voidmain()(chara[30],b[30];inti=0;scanf("%s%s"zazb);while(a[i]==b[i]&&a[i]&&b[i])i++；if(a[i]==b[i])printf("%s等于%s\n”,a,b);elseif(a[i]<b[i])printf("%s小于％s\n，a,b);elseprintf("%s大于%s\n”,a,b);}*1、 通过键盘输入3个整数,输出最大值和最小值#include<stdio.h>voidmain()(inta,b,c,max,min;scanf(“％d%d%d，&a,&b,&c);max=min=a;if(b>max)max=b;if(c>max)max=c;if(b<min)min=b;if(c<min)min=b;printf("最大值为％d,最小值为％d\nツmax,min);}2、从键盘输入圆的半径r和一个整型数k,当k=l时,计算并输出圆的面积;当k=2时,计算并输出圆的周长。编程实现以上功能#include<stdio.h>voidmain()(intrzk;scanf("%d%d"/&rz&k);if(k==l)printf("圆的面积为％f\nツ3.1415926ケ・r);if(k==2)printf("圆的周长为％f\n”31415926*2*ij;}3、编程实现:输入整数a和b,若a2+b2大于100,则输出a2+b2百位以上的数字,否则输出两数之和。#include<stdio.h>voidmain()(inta,b;scanf("%d%d"/&a/&b);if(a*a+b*b>100)pnntf("%d\nnz(a*a+b*b)/100);elseprintf("％d\n”,a+b);}4、从键盘上输入两个整数,判断其大小关系并将结果输出。#include<stdio.h>voidmain()(inta,b;scanf("%d%d"z&az&b);if(a>b)printf("a>b\n");elseif(a<b)printf("a<b\n");elseprintf("a==b\n");}5、猜数游戏。先将要猜的整数存放在变量num中,当程序运行时,提示游戏者通过键盘输入自己所猜的数cai,若猜对了,即cai==num,屏幕显示"*・恭喜你猜中了!**",然后结束程序运行;如果猜错了,屏幕除了显示"**对不起,你猜错了!**"外,还显示是猜大了或猜小了的信息,以帮助游戏者继续往正确处猜。#include<stdio.h>voidmain()intnum=100zcai;scanf("%d"z&cai);if(cai==num)printf("**恭喜你猜中了!*・、n")；elseif(cai<num)print"'**对不起,你猜错了!*・、n**你猜小了!*・、n")；elseprintf(”**对不起,你猜错了!*・、n*・你猜大了!*・、n")；6、将一个正整数分解质因数。例如:输入90,打印出90=2*3*3*5。#include<stdio.h>voidmain(){inti,a,f=l;scanf("%d",&a);pnntf(n%d=l",a);for(i=2;i<=a;i++)while(a%i==0){a/=i;printf("*%d",i);}}7、求输入的十个整数中正数的个数及其平均值。#include<stdio.h>voidmain(){inti,a,n=0;floatsum=0;for(i=l;i<=10;i++){scanf("%d",&a);if(a>0){sum+=a;n++;}}printf("正整数的个数为％d,正整数的平均值为％f\n",n,sum/n);}8、某旅行团有男人、女人和小孩共30人,在纽约一家小饭馆里吃饭,该饭馆按人头收费,每个男人收3美元,每个女人收2美元,每个小孩收1美元,共收取50美元。共有多少组解?#include<stdio.h>voidmain(){inti,j,k;for(i=l;i<=10;i++)for(j=l;j<=15;j++)if(i*3+2*j+30-i-j==50)printf("男人％d人,女人％d人,小孩%(1A\n",i,j,30-i-j);)9、在输入的ー批正整数中求出最大者,输入。结束循环。#include<stdio.h>voidmain()intx,max;scanf("%dM,&x);max=x;while(x!=O){ scanf("%d,,/&x);if(x>max)max=x;}printf("最大值为%d\n",max);}输出所有的"水仙花数"。所谓的"水仙花数"是指ー个3位数,其各位数字的立方和等于该数本身。例如,153是ー个水仙花数,因为153=13+53+33#include<stdio.h>voidmain()(inti,nl,n2,n3;for(i=100;i<1000;i++){nl=i/100;n2=i/10%10;n3=i%10;if(nl*nl*nl+n2*n2*n2+n3*n3*n3==i)printf(,'%d\n"J);}}将从键盘输入的ー对数,由小到大排序输出,当输入ー对相等数时结束循环。#include<stdio.h>voidmain()(intnl,n2;scanf("%d%d"/&nl/&n2);while(nl!=n2)(if(nl>n2)printf("%dz%d\n"/n2/nl);elseprintf("%d/%d\n"/nl/n2);scanf("%d%d,'z&nl/&n2);}}12、使用循环语句实现如下图形的输出1123123451234567123456789*/#include<stdio.h>voidmain()intij;for(i=l;i<=5;i++){ for(j=l;j<=5-i;j++)printf("");for(j=l;j<=2*i-l;j++)printf(',%d"J);printf(H\n");)"1、 输入某年某月某日,判断这一天是这一年的第几天?#include<stdio.h>voidmain()(inty,m,d,sum=0;scanf("%d%d%d"/&y/&m/&d);jf(y%4==0&&y%100!=0||y%400==0)sum=l;switch(m)(casel:sum=d;case2:sum=d+31;case3:sum+=d+31+28;case4:sum+=d+31+28+31;case5:sum+=d+31+28+31+30;case6:sum+=d+31+28+31+30+31;case7:sum+=d+31+28+31+30+31+30;case8:sum+=d+31+28+31+30+31+30+31;case9:sum+=d+31+28+31+30+31+30+31+31;case10:sum+=d+31+28+31+30+31+30+31+31+30;casell:sum+=d+31+28+31+30+31+30+31+31+30+31jcase12:sum+=d+31+28+31+30+31+30+31+31+30+31+30;}printf("%d年％d月％d日是这一年的第％d天、n”,y,m,d,sum);}#include<stdio.h>voidmain(){inty,m,d,sum=0;scanf("%d%d%d",&y/&m/&d);switch(m)case12:sum+=30;casell:sum+=31;case10:sum+=30;case9:sum+=31;case8:sum+=31;case7:sum+=30;case6:sum+=31;case5:sum+=30;case4:sum+=31;case3:sum+=28;case2:sum+=31;casel:sum+=d;}jf((y%4==0&&y%100!=0||y%400==0)&&m>2)sum+=l;printf("%d年％d月％d日是这一年的第％d天、n”,y,m,d,sum);)2、编程判断输入的正整数是是否既是5又是7的整倍数。若是,则输出yes:否则输出no。#include<stdio.h>voidmain(){inty;scanf(“%d”,&y);if(y%5==0&&y%7==0)printf("yes\nH)；elseprintf("no\nH);}3、简单计算器程序。用户从键盘输入两个整数和一个字符,字符必须是屮、」、メ、ズ其中的ー个,然后程序输出两数作相应运算的结果。输出计算结果。#include<stdio.h>voidmain(){inta,b;charc;scanf(“％d%c%d“,&a,&c,&b);switch(c)(case,+':printf("%d%c%d=%d\n"/a,c/b/a+b);break;case,-':printf("%d%c%d=%d\n"/a/c/b/a-b);break;case'*':printf("%d%c%d=%d\n",a/c/b/a*b);break;case7，:printf("%d%c%d=%f\n"/a/c,b/(float)a/b);break;}4、从键盘输入3个整数,按由小到大的顺序输出。#include<stdio.h>voidmain()(inta,b,c,t;scanf("%d%d%d",&az&bz&c);if(a>b){t=a;a=b;b=t;}if(b>c){t=c;c=b;b=t;}if(a>b){t=a;a=b;b=t;}printf("%d%d%d\n，a,b,c);}5、ー球从100米高度自由落下,每次落地后反跳回原高度的一半;再落下,求它在第10次落地时,共经过多少米?第10次反弹多髙?#include<stdio.h>voidmain()(inti;floatt=100,sum=100;for(i=l;i<10;i++)(t=t/2;sum+=t*2;}printf("%f%f\n",sum/t/2);}6、百钱买百鸡:ー百个铜钱买了一百只鸡,其中公鸡ー只5钱、母鸡ー只3钱,小鸡ー钱3只,问ー百只鸡中公鸡、母鸡、小鸡各多少?#include<stdio.h>voidmain()(inti,j,k;for(i=l;i<=20;i++)for(j=l;j<=33;j++)for(k=3;k<100;k+=3)if(5*i+3*j+k/3==100&&i+j+k==100)printf("%d%d%d\n",i,j,k)；}7、输出半径为1到10的圆的面积，当面积大于:100时停止输出。#include<stdio.h>voidmain()inti;floatarea;for(i=l;i<=10;i++){area=3.1415926*i*i;if(area>100)break;printf("半径:％d,圆的面积:%f\nソ,area);)}8、猜数游戏:任意设置ー个整数,请用户从键盘上输入数据猜测设置的数是什么,告诉用户是猜大了还是小了。如果10次以内猜对答案,用户获胜。否则,告诉用户设置的数据是什么。#include<stdio.h>voidmain()(inti,s=100,cai;for(i=l;i<=10;i++){scanf(”％d”,&cai);if(cai==s)break;if(cai<s)printf(“猜小了、n")；elseprintf("猜大了、n“)；}if(i<=10)printf("恭喜你,猜对了!、バ)；elseprintf("不好意思,你猜错了,正确答案是％d\n",s);}9、计算:s=l+12+123+1234+12345o#include<stdio.h>voidmain()(inti,s==O,t=O;for(i=l;i<=5;i++){t=t*10+i;s+=t;}printf(”％d、n”,s);}输出100以内能被3整除且个位数为6的所有整数#include<stdio.h>voidmain()inti,t=0;for(i=0;i<=9;i++){t=i*10+6;if(t%3==0)printf("％d\nソ)；}}键盘上输入若干个学生的成绩,统计并输出最髙成绩和最低成绩,当输入负数时结束输入#include<stdio.h>voidmain()(inti,score,max,min;scanf("%d",&score);max=min=score;while(score>=0){scanf("%d",&score);if(score>max)max=score;if(score<min&&score>=0)min=score;}printf("最高成绩为:％d,最低成绩为:%d\nH,max,min);自然常数e的计算公式为e=l+l/l!+l/2!+l/3!+...+l/n!+..<〇请编制程序计算e的近似值,要求被舍弃的首项1/n!<0.000001o*/#include<stdio.h>voidmain(){floatn=l,e=l,t;t=l/n;while(t>=0.000001){e+=t;n++;t*=l/n;)printf("%.10f\n",e);}例2.1#include<stdio.h>main(){doublea,b,area;a=1.2; /・将矩形的两条边长分别赋给a和b*/b=3.6;area=a*b; /・计算矩形的面积并存储到变量area中・/printf("a=%f,b=%f,area=%f\n",a/b,area); /・输出矩形的两条边长和面积・/例2.2include"stdio.h"#definePI3.14159 /・定义符号名PI为3.141597main(){doubler,s;r=5.0;s=PI*r*r;printf(Ms=%f\n",s);}2.24#includestdio.h;main();/*mainfunction*/floatr,s;/*/*risradius*/,/*sisareaofcircular*/*/r=5.0;s=3.14159ケ・r;printfド％f\n",s)printf("%f\n",s)2.25main/*mainfunction*/{floata,b,c,v;/*a,b,caresides,visvolumeofcube*/a=2.0;b=3.0;c=4.0v=a*b*c;printf("%f\n",v)}3.2.1#include<stdio.h>main(){inti=2518;doublea=3.1415;printf("i=%d,a=%f,a*10=%e\n",i,a,a*10);例3.1#include<stdio.h>main(){intx,y,t;printf(HEnterx&y:\n");scanf(M%d%d,,/&x,&y);printf("x=%dy=%d\n",x,y);t=x;x=y;y=t;printf("x=%dy=%d\n",x,y);}例3.2#include<stdio.h>main(){doublex;printf("Enterx:\n");scanf(M%lfM/&x);printf("(l)x= x);x=x*100;x=x+0.5;x=(int)x;x=x/100;printf("(2)x=%f\n,,zx);}3.4#include<stdio.h>main(){intx=10,y=3;printfド%d\n",y=x/y);}3.16main{doublea,b,c,s,v;printf(inputa,b,c:\n);scanf("%d%d%d”,a,b,c);s=a*b; /*计算长方形面积・/v=a*b*c; /*计算长方体体积・/printfド％d%d%dウa,b,c);printfドs=%f\n/；sjv=%d\n»;例4.1#include<stdio.h>main(){intx,y;printf("Enterx&y:\n")；scanf("%d%d"/&x,&y);printf("x,y:%d%d\n",x,y);if(x>y)printf("x=%d\n",x);if(y>x)printf("y=%d\n"/y);if(x==y)printf("x==y%d:\n"zx);}例4.2#include<stdio.h>main(){inta,b,c,t;printf("inputa,b,c:”)；scanf("%d%d%d"z&az&bz&c);printf("a=%dzb=%dzc=%d\n"zazbzc);if(a>b) /・如果a比b大,则进行交换,把小的数放入a中・/{t=a;a=b;b=t;}if(a>c) /・如果a比c大,则进行交换,,把小的数放入a中・/{t=a;a=c;c=t;} /・至此a、b、c中最小的数已放入a中・/if(b>c) /・如果b比c大,则进行交换，把小的数放入b中・/{t=b;b=c;c=t;} /・至此a、b、c中的数已按由小到大顺序放好*/printf("%d,%d,%d\n",a,b,c);}例4.3#include<stdio.h>main(){intxzy;printf("Enterx&y:");scanf(H%d%d"z&xz&y);printf("xzy:%d%d\nHzxzy);if(x>y)printf(Hmax=x=%d\n"zx);elseprintf("max=y=%d\n"zy);printf(”**end**\n“)；}例4.4#include<stdio.h>main(){intn;printf("inputn:");scanf(“％d“，&n);if(n%3==0) /*判断n能否被3整除・/printf("n=%dYES\n",n);elseprintf(”n=%dNO\n",n);例4.5#include<stdio.h>main(){intg;printf(HEnterg:scanf(”%d”,&g);printf("g=%d:\g);if(g>=90)printf("A\n");elseif(g>=80)printf("B\n");elseif(g>=70)printf("C\nM);elseif(g>=60)printf("D\n");elseprintf("E\nn)；例4.6#include<stdio.h>main(){intg;printf("Enteramark:");scanf("%d",&g);/*g中存放学生的成绩ッprintf("g=%d:nzg);switch(g/10){case10:case9:printf("A\n")；case8:printf("B\n");case7:printf(HC\n");case6:printf("D\n");default:printf("E\n");}#include<stdio.h>main(){intg;printf("Enteramark:");scanf(&g);/*g中存放学生的成绩ッprintf("g=%d:M/g);switch(g/10){case10:case9:printf("A\n");break;case8:printf("B\nH);break;case7:printf("C\n");break;case6:printf("D\n");break;default:printf("E\n");}}4.5#include<stdio.h>main(){inta=2,b=-l,c=2;if(a<b)if(b<0)c=0;elsec+=1;printfド％d\n”,c);}4.6#include<stdio.h>main(){intw=4,x=3,y=2,z=l;printfぐ’％d\n",(w<x?w:z<y?z:x));}4.7#include<stdio.h>main(){inta,b,s;scanf("%d%d”,&a,&b);s=a;if(a<b)s=b;s*=s;printf("%d\n,：s);4.9#include<stdio.h>main(){intk=-3;if(k<=O)printf(//****\nw)elseprimf("&&&&、&');4.17#include<stdio.h>main(){inta=100;if(a>100)printf("%d\n”,a>100);elseprintf("%d\n",a<=100);例5.1#include<stdio.h>main(){intizsum;i=0;sum=0; /*i和sum的初值为0*/while(sum<10000)/・当sum小于!0000时执行循环体・/{sum+=i*i;/*sum累加1的平方・/i++; /・在循环体中每累加一次后,i增1ツ}printf("n=%dsum=%d\n",i-lzsum);例5.2#include<stdio.h>include<math.h>/・调用fabs函数时要求包含math.h文件37main(){ints;floatn,t,pi;t=1.0; /*t中存放每项的值,初值为1*/pi=0； /*pi中存放所求打的值,初值为0*/n=1.0; /*n中存放每项分母・/s=l; ドs为符号位,其值在1和-1之间变化・/while(fabs(t)>=le-6){pi=pi+1;n+=2.0;/*改变符号*/t=s/n;}pi=pi*4;printf("pi=%f\n,,,pi);}例5.3#include<stdio.h>#include<math.h>main(){doublexl,x2;xl=0.0;x2=cos(xl);while(fabs(x2-xl)>le-6){xl=x2;x2=cos(xl);}printf(,,x=%f\n"/x2);例5.4#include<stdio.h>main(){intflzf2,f;fl=0;f2=l;do{f=fl+f2;fl=f2;f2=f;}while(f2<=1000);printf("F=%d\n",f2);例5.5#include<stdio.h>main(){inti,sum;sum=0; /*sum的初值为〇・/for(i=l;i<=100;i++) /・当i小于或等于100时执行循环体57sum+=i; /・在循环体中累加i一次ッprintf("sum=%d\n",sum);例5.6#include<stdio.h>main(){doubler,s,Pi=3.1416;for(r=0.5;r<=2.5;r+=0.5){s=Pi*r*r; /*计算圆面积s的值・/printf("r=%3.1fs=r,s);}例5.7#include<stdio.h>main(){intk,i,j;for(i=0;i<4;i++){for(k=l;k<=i;k++)printf("");for(j=0;j<7-i*2;j++)printf("*M);printf(n\n")；}例5.8#include<stdio.h>main(){intk,i,tag;for(i=2;i<=100;i++){tag=0;for(k=2;k<i;k++)if(i%k==0)tag=l;if(tag==0)printf(”％d,”,i);}}#include<stdio.h>#include<math.h>main(){intk,i,tag;printf("2,");for(i=3;i<=100;i+=2){tag=0;for(k=2;tag==0&&k<sqrt(i);k++)if(i%k==0)tag=l;if(tag==0)printf("％d,”，i);})例5.9#include<stdio.h>main(){inti,s;s=0;for(i=1;;i++){s=s+i;if(s>5000)break;}printf("s=%d,i=%d\n",s,i);例5.10#include<stdio.h>main(){intk=0,s=0,i;for(i=1;i<=5;i++){s=s+i;if(s>5){printf("****i=%d,s=%d,k=%d\n",i,s,k); /*1#输出语句・/continue;}k=k+s;printf("i=%d,s=%d,k=%d\n",i,s,k);/*2#输出语句・/}例5.11#include<stdio.h>main(){intx,max;printf("Enter-ltoend:\n");do{printf(HEnterx:");scanf("%d",&x);}while(x<0&&x!=-1);max=x;while(x!=-1){printf("Enterx:");scanf("%dM/&x);if(x>0&&x>max)max=x;/*max始终存放大于零的最大值・/}if(max!=-1)printff'max=%d\n",max);}例5.12#include<stdio.h>#include<math.h>main(){floata,xO,xl;printf("\nlnputa:");scanf("%f",&a);if(a<0)printf("error!\n");/・不能求负数的平方根・/else{x0=a/2;xl=(x0+a/xO)/2;do{xO=xl;xl=(x0+a/xO)/2;)while(fabs(xO-xl)>le-6);printf("sqrt(%f)=%f标准sqrt(%f)=%f\n",a,xl,a,sqrt(a));}}5.5#include<stdio.h>main(){int\,sum;for(i=1;i<6;i++)sum+=sum;printf("%d\n",sum);}5.6#include<stdio.h>main(){inty=10;for(;y>0;y-)if(y%3==0){printf("%d",-y);continue;}}5.8#include<stdio.h>main(){inti;for(i=1;i<=5;i++){if(i%2)printf(〃*");elsecontinue;printf("#");}printf("$\n");}5.10#include<stdio.h>main(){intx,i;for(i=l;i<=100;i++){x=i;if(++x%2==0)if(++x%3==0)if(++x%7==0)printf("%d”,x);}printf("\n");}5.13#include<stdio.h>main(){intx=2;while(X-);printf("％d\n",x);5.16#include<stdio.h>main(){floatx,amax,amin;scanf("%r,&x);amax=x;amin=x;while([1]){if(x>amax)amax=x;if([2])amin=x;scanf("%f〃,&x);)printf("\namax=%f\namin二％f\n”,amax,amin);}例6.1#include<stdio.h>main(){charch;inti;for(i=0;i<26;i++){ch=i+65;if(i%2==0)printf("\n");printf("c=%cASCII=%d",ch,ch);}putchar(\n);)例6.2#include<stdio.h>main()(printf("PressEntertocontinue\nH);while(getchar()!=*\n');}例6.3#include<stdio.h>main(){chare;while((c=getchar())!='\n'){if(c>='a'&&c<='z')c=c-'a'+'A';putchar(c);}putchar('\n');例6.4#include<stdio.h>#include<ctype.h>main(){longn=O;charch;while((ch=getchar())!='!') /・未遇到结束标志时循环继续・/if(isspace(ch))n++;printf("n=%ld\n，n);例6.5#include<stdio.h>#include<ctype.h>main(){chare;c=getchar();while(c!ゴ@リ/・未遇到结束标志时循环继续・/{if(isalpha(c))/・调用函数判断c中是否为字母*/{c=tolower(c);/・调用函数把大写字母转换成小写字母・/c=(c-'a,+l)%26+'a';)putchar(c);c=getchar();}printf(n\nM);}6.7#include<stdio.h>main(){charcl=A/c2=Y;printfド%d,%d\n”,cl,c2);}6.8#include<stdio.h>main(){charx=A;x=(x>=A&&x<=Z)?(x+32):x;printf("%c\n",x);6.9#include<stdio.h>main(){charch;ch=A+5-3;printf("%d,%c\n”,ch,ch);}6.10#include<stdio.h>main(){intc;while((c=getchar())!=\n){switch(c-2){case0:putchar(c+4);:putchar(c+4);break;:putchar(c+3);:putchar(c+2);break;}}printf(〃\n");}例7.2#include<stdio.h>voidtry(int,int,int);/*说明函数try为无值型,含有3个int类型的形参ッmain(){intx=2,y=3,z=0;printf("⑴x=％dy=%dz=%d\n",x,y,z);try(x,y,z);printf("(4)x=%dy=%dz=%d\n",x,y,z);}voidtry(intx,inty,intz){printf("(2)x=%dy=%dz=%d\n",x,y,z);z=x+y;X=X*X；y=y*y;printf("⑶x=%dy=%dz=%d\n",x,y,z);例7.3#include<stdio.h>voidswap(intzint);/・函数说明语句・/main(){intx=10,y=20;printf("⑴x=%dy=%d\n",x,y);swap(x,y);printf("⑷x=%dy=%d\n",x,y);voidswap(inta,intb){intt;printf("(2)a=%db=%d\n",a,b);t=a;a=b;b=t;printf("⑶a=%db=%d\n",a,b);}例7.4#include<stdio.h>intisprime(int); /*isprime函数的说明语句・/main(){intx;printf("Enteraintegernumber:")；scanf("%d",&x); /*从键盘输入ー个整数・/if(isprime(x))printf("%disprime\n",x); /*当函数返回1时,输出”是素数“ツelseprintf("%disnotprime\n",x);/*当函数返回〇时,输出"不是素数”*/}intisprime(inta){inti;for(i=2;i<=a/2;i++)if(aintisprime(inta){inti;for(i=2;i<=a/2;i++)if(a%i==0)return0;return1;/*a一旦能被某个数整除,即不是素数,返回。*//*a不能被2到a/2之间任何ー个数整除,返回1*/例7.5/♦/♦isprime函数的说明语句・//♦/♦even函数的说明语句・/{inta;printf("Enteraevennumber:");scanf("%d"z&a);if(a%2==0)even(a);elseprintf("The%disntevennumber'd,a);}voideven(intx) /・定义even函数*/{inti;for(i=2;i<=x/2;i++)if(isprime(i))if(isprime(x-i)){printf("%d=%d+%d\n",x,i,x-i);return;}}intisprime(inta)/*isprime函数定义与例フ.4同,在此省略・/{……}例7.6#include<stdio.h>intsum(int);/*sum函数的说明语句・/intf(int);/*f函数的说明语句・/main(){inta,b;printf("Enteraintegernumber:n); /・输入ー个整数・/scanf("%d",&a);b=sum(a); /・调用sum函数求f(x)的累加和・/printf("a=%dsum=%d\n",a,b);}intsum(intn) /・定义sum函数*/{intx,s=0;for(x=0;x<=n;x++)s+=f(x);returns; /・返回累加和57}intf(intx) /・定义f(x)函数・/{returnx*x+l;}例7.7#include<stdio.h>#include<math.h>doubleinteg(doublea,doubleb){doubles,x,h;intn=100,i;h=fabs(b-a)/n; /*fabs()为求绝对值函数・/s=(sin(a)+sin(b))/2.0;for(i=1;i<=n-1;i++){x=a+i*h;s=s+sin(x);}s=s*h;returns;}main(){doubles;s=integ(0.0,1.5);printf("s=%f\n"/s);例7.8#include<stdio.h>#include<ctype.h>charmyupper(charch){if(ch>=a&&ch<=z)ch=ch-32;returnch;}main(){charc;while((c=getchar())!='@*){c=myupper(c);putchar(c);})例7.9#include<stdio.h>Longcountch();/*countch函数说明语句・/main(){longn;n=countch();printf("n=%ld\n",n);longcountch(){longcn;for(cn=0;getchar()!='@';cn++);returncn;}例7.10#include<stdio.h>#defineIN1 /・标志在一个单词的内部・/#defineOUTO /・标志在ー个单词的外部・/intcountword(); /・函数说明语句・/main(){intn;n=countword();pnntf("n=%d\n",n);}intcountword(){intc,nw,state;state=OUT; /・在单词的外部57nw=0;while((c=getchar())!=@){if(c=="||c==,\n,||c==,\t,)state=OUT; /・读入的字符是分隔符,在ー个单词的外部ッelseinstate==OUT) /・如果遇到单词的第一个字符・/{state=IN; /・状态变量置成IN:在单词的内部・/nw++; /・单词个数增1*/})returnnw;}7.4#include<stdio.h>intfunc(inta,intb){intc;c=a+b;returnc;}main(){intx=6,y=7,z=8,r;r=func((x-ウy++,x+yレz—)；printf("%d\n",r))7.5#include<stdio.h>intf(int,int);main(){inti=2,p;p=f(i,i+1);printf(〃%d\n”,p);}intf(inta,intb){intc;c=a;if(a>b)c=1;elseif(a==b)c=0;elsec=-1;return(c);}7.6#include<stdio.h>intfun(inta,intb,intc){c=a*b;}main(){intc;fun(2,3,c);printf("%d\n",c);}7.7#include<stdio.h>doublef(intn){inti;doubles;s=1.0;for(i=1;i<=n;i++)s+=1.0/i;returns;)main(){inti,m=3;doublea=0.0;for(i=0;i<m;i++)a+=f(i);printf("%f\n",a);7.8#include<stdio.h>unsignedfun6(unsignednum){unsignedk=1;do{k・二num%1〇;num/=10;}while(num);returnk;}main(){unsignedn=26;printfド%d\n”,fun6(n));}7.9#include<stdio.h>doublesub(doublex,doubley,doublez){y-=1.0;z=z+x;returnz;}main(){doublea=2.5,b=9.0;printfウsub(b-a,a,a));}7.10#include<stdio.h>intfun2(inta,intb){intc;c=(a*b)%3;returnc;}intfunl(inta,intb){intc;a+=a;b+=b;c=fun2(a,b);returnc*c;)main(){intx=11,y=19;printf("%d\n",fun1(x,y));}例8.1

include<stdio.h>main(){inta,b,min,*pa,*pb,*pmin;/・输入的值依次放入/・输入的值依次放入pa、pb所指存储单元中・//・通过输出,验证a、b中的值・//・假定a中的值最小,将其赋给min*//・若b中的值比a小,将其赋给min*//・输出小值・/printf("a=%db=%d\n",a,b);*pmin=*pa;if(*pa>*pb)*pmin=*pb;printf("min=%d\n",min);}例8.2#include<stdio.h>intmyadd(int*a,int*b){intsum;sum=*a+*b;returnsum;}main(){intx,y,z;printf("Enterx,yゴ')；scanf("%d%d",&x,&y);z=myadd(&x,&y);printf("%d+%d=%d\n",x,y,z);例8.3#include<stdio.h>voidswap(int*,int*);main(){intx=30,y=20;printf("⑴x=%dy=%d\n",x,y);swap(&x,&y);printf("(4)x=%dy=%d\n",x,y);}voidswap(int*a,int*b){intt;print"。)a=%db=%d\n",*a,*b);t=*a;*a=*b;*b=t;printf("(3)a=%db=%d\n",*a,*b);例8.4#include<stdio.h>voidswap(int*xl,int*x2){intt;t=*xl;*xl=*x2;*x2=t;}voidorder(int*azint*b){if(*a>*b)swap(a,b);}main(){intx,y;printf(nEnterx,y:");scanf("%d%d"/&xz&y);printf(Hx=%dy=%d\n"/x/y);order(&x,&y);printf(Hx=%dy=%d\n"/x,y);例8.5#include<stdio.h>int*fun(int*zint*); /・函数说明语句・/main(){int*pjJ;printf("Entertwonumber:");scanf("%d%d"/&i,&j);p=fun(&L&j); /*p将得到i或j的地址・/printf("i=%dj=%d,*p=%d\n"/j,*p);}int*fun(int*a,int*b){if(*a>*b)returna;returnb;}8.2#include<stdio.h>main(){printf("%d\n〃,NULL);}83#include<stdio.h>voidsub(intx,intyzint*z){*z=y-x;}main(){inta,b,c;sub(10,5,&a);sub(7,a,&b);sub(a,b,&c);printf("%d,%d,%d\n”,a,b,c);8.4#include<stdio.h>main(){intk=2,m=4,n=6,*pk=&k,*pm=&m,*p;♦(p=&n)=*pk*(*pm);printf(〃％d\n”,n);8.8#include<stdio.h>voidprtv(int*x){printf(〃％d\n”,++*x);}main(){inta=25;prtv(&a);}8.9#include<stdio.h>main(){int**k,*a,b=100;a=&b;k=&a;printf(〃％d\n”,**k);}8.10#include<stdio.h>voidfun(float*azfloat*b){floatw;*a=*a+*a;w=*a;*a=*b;*b=w;}main(){floatx=2.0zy=3.0,*px=&x,*py=&y;fun(px,py);printf(//%2.0f/%2.0f\n/：x,y);}8.11#include<stdio.h>voidsub(doublex,double*y,double*z){*y=*y-1.0;*z=*z+x;}main(){doublea=2.5,b=9.0,*pa,*pb;pa=&a;pb=&b;sub(b-a,pa,pa);printf("%f\n",a);8.14#include<stdio.h>intast(intx,inty,int*cp,int*dp){*cp=x+y；*dp=x-y;}main(){intc,d;ast(4,3,&c,&d);printf("%d%d\n”,c,d);例9.1#include<stdio.h>#defineM30main(){ints[M],i,k=l;for(i=0;i<M;i++){s[i]=k;k+=2;} /*给s数组元素依次赋1、3ヽ…*/printf("\nSequenceOutput:\n")；/・按从前到后的顺序输出・/for(i=0;i<M;i++){printf("%4d"/s[i]);if((i+l)%10==0)printf("\n");/・利用i控制换行符的输出ッ}printf("\nlnvertOutput:\n");/・按从后到前的顺序输出・/for(i=M-1;i>=0;i-) /・下标值从大到小・/printf("%3d%c",s[i],(i%10==0)?'\n':"); /・利用条件表达式来决定输出换行符还是输出空格・/printf("\nM)；例9.2#include<stdio.h>#defineM100voidarrout(int*zint);/・函数说明语句,此函数用以输出数组中的值・/intarrin(int♦); /・函数说明语句,此函数用以给数组输入数据・/main(){ints[M]zk;k=arrin(s); /*k得到输入数据的个数・/arrout(s,k);}intarrin(int*a){inti,x;i=0;scanf("%d",&x);while(x>=0){*(a+i)=x;i++；scanf(“％d”,&x);}returni;}voidarrout(int*a,intn){inti;for(i=0;i<n;i++)printf(((i+l)%5==0)?"%4d\n":"%4d",*(a+i));/・根据i的值来确定使用不同的格式串・/printf("\n");}例9.3#include<stdio.h>#defineM10#defineB4voidsetstar(char*,int);voidarrout(char*,int);main(){charc[M]={A/B,C,D,E,F,G,H,I,J};setstar(&c[4],M-B);arrout(c,M);voidsetstar(char*azintn){inti;for(i=0;i<n;i++)*(a+i)=*;}voidarrout(char*a,intn){inti;for(i=0;i<n;i++)printf("%c"za[i]);printf(H\n");}#include<stdio.h>#defineN10int*fun(inta[N]zintn){intb[N];returnb;main(){intw[N]z*p;p=fun(wzN);}例9.4#include<stdio.h>#include"stdlib.h"#defineSIZE15#defineN3voidgetrand(int*zint); /・三个函数说明语句・/voidgetave(int*zint*zint);voidpriarr(int*zint);main(){intx[SIZE],w[SIZE/N]={0}; /*w数组中置初值〇,准备存放5个和值・/getrand(x,SIZE);/・产生15个随机数放入x数组中・/printf("Output%drandomnumbers:\n",SIZE);priarr(x,SIZE); /・输出15个随机数ッgetave(x,w,SIZE);/*每3个数求一个和数放入w数组・/printf(nOutput5sumnumbers:\n");priarr(wySIZE/N);}/・输出5个和数・/voidgetrand(int*azintn){inti;for(i=0;i<n;i++)a[i]=rand()%50;}voidgetave(int*a,int*b,intn){inti,j,sum;for(sum二〇」ニ〇/=0;i<=n;i++){sum+=a[i];if((i+l)%3==0){b[j]=sum;sum=0;j++{sum+=a[i];if((i+l)%3==0){b[j]=sum;sum=0;j++；)/・每累加3个数进行一次处理・//*和值放入w数组中・//・置〇,准备重新累加・//・下标增1*/voidpriarr(int*a,intn){inti;for(i=0;i<n;i++){printf(”％5d，a[i]);if((i+l)%5=0)printf("\n");}printf("\nn);)例9.5#include<stdio.h>#defineNUM8voidinvert(int*,int); /・函数说明语句・/voidpriout(int*,int); /・函数说明语句・/main(){/・用置初值的方法给a数组放入数据・/inta[NUM]={10,20,30,40,50,60,70,80);printf("〇utputprimarydata:"); /・输出原始数据・/priout(a,NUM);invert(a,NUM);printf("Outputtheinversedata:"); /・输出颠倒后的数据・/priout(a,NUM);voidpriout(ints[],intn){inti;for(i=0;i<n;i++)printf("%4d",s[i]);printf("\nn)；}voidinvert(int*a,intn){inti,j,t;i=0;j=n-l;while(i<j)/*i是最前元素的下标,j是最后元素的下标*/当i大于或等于j时,对调完成・/{t=a[i];a[i]=a[j];a[j]=t;i++；j-；}/・下标为i和j的两个元素中的值对调ッ/*!向后移ー个位置,j向前移ー个位置*/例9.6#include<stdio.h>#include<stdlib.h>#defineM50#defineN10voidgetdata(int*s){inti;for(i=0;i<M;i++)s[i]=rand()%10;)voidstat(int*a,int*c){inti;for(i=0;i<N;i++)c[i]=0;for(i=0;i<M;i++)c[a[i]]++;)ドc数组元素置初值0ッ/・用c数组的元素对各整数进行统计・/voidoutdata(int*c){inti;for(i=0;i<N;i++)printf(H%d:%d\n",i,c[i]);main(){inta[M],c[N];getdata(a);stat(a,c);printf("Outputtheresult:\n");outdata(c);例9.7#include<stdio.h>#defineNUM30intarrin(int*a){intizn;Do /・当指定数组元素个数超出范围时,重新输入*/{printf(HEnternumberofelements,0<=n<&d:",NUM);scanf("%d",&n);}while((n<1)||(n>=NUM));/・注意:输入的n个整数,放入a[0]至a[n・l]中,a[n]在查找时用作辅助空间・/printf("Enter%dintegernumbers:\n",n);for(i=0;i<n;i++)scanf("%d",a+i);returnn;intsearch(int*a,intx,intn){inti,p; /・查找开始・/i=0; /・从a[0]元素开始查找・/a[n]=x; /・把待查找的数放入a[n)中・/while(x!=a[i])i++;/・只要x值等于当前a[i]的值,则退出循环，否则i后移一位ッif(i==n)p=-1;/・没找到・/elsep=i; /*找到・/returnp;}main(){inta[NUM],x,n,p;/・暂定数组含30个元素,下标的上限为29*/n=arrin(a);printf("Enterthenumbertosearch:x=");scanf("%d",&x);p=search(a,x,n);if(p!=-l)printf("%dindexis:%d\n",x,p); /・输出x所在下标ッelseprintf("%disnotfound!\n",x); /・输出没找到信息・/)例9.8#include<stdio.h>#defineNUM10 /・假定数组含有10个元素・/intarrdel(int*,int,int);/*函数说明语句・/voidarrout(int*,int); /*函数说明语句・/intgetindex(intn);main() /・用置初值的方法给数组置数・/{intn,d,a[NUM卜{21,22,23,24,25,26,27,28,29,30};n=NUM;printf("Outputprimarydata:\n"); /・输出原始数据・/arrout(a,n);d=getindex(n);n=arrdel(a,n,d);printf("Outputthedataafterdelete:\nn); /*输出删除后的数据・/arrout(a,n);}voidarrout(intw[],intm){intk;for(k=0;k<m;k++)printf("%dH,w[k]);printf("\n")；}intarrdel(int*w,intn,intk){inti;/*以下循环进行如图9.4所示的删除操作・/for(i=k;i<n-l;i++)w[i]=w[i+l];n-； /・删除后数据个数减1*/returnn;}getindex(intn){inti;Do /・当指定的下标值落在数据所在下标范围内时,退出循环,返回该下标值・/{printf("\nEntertheindex[0<=i<%dJ:，n); /*输入待删元素的下标ッscanf(H%d",&i);}while(i<0||i>n-l);returni;例9.9#include<stdio.h>#defineNUM6voidarrso