c语言程序(2)

1、1.分段函数2x+3(x0)8y=3x-6(x0)#includemain()float x,y;scanf(%f,&x);if(x0) y=2*x+3 ;if(x=0)y=8;if(x0) y=5*x-6;printf(%fn,y);2.输入 3 个整数，输出其中最大数#includemain()int a,b,c,d;scanf(%d%d%d,&a,&b,&c);if(ab) d=a ;elsed=b;if(cd) d=c;printf(%dn,d);3.ax2+bx+c=0(要求 a 不等于 0，b2-4ac=0)a,b,c 由键盘输入#include#i

2、ncludemain()float a,b,c,d,x1,x2;scanf(%f%f%f,&a,&b,&c);d=sqrt(b*b-4*a*c);x1=(-b+d)/(2*a);x2=(-b-d)/(2*a);printf(x1=%f,x2=%fn,x1,x2);4.输入任意两个数，求其最大公因数和最小公倍数#include main()int m,n,r,p;scanf(%d%d,&m,&n);p=m*n;r=m%n;while (r!=0)m=n;n=r;r=m%n;printf(%d%dn,n,p/n);5.求 1+2+3+ +n 的和 n 由键盘

3、输入#include main()int n,i;double s;scanf(%d,&n);for(s=0,i=1;i=n;i+)s=s+i;printf(s=%lfn,s);6.求 1*2*3* *n 的积， n 由键盘输入#include main()int n,i;double s;scanf(%d,&n);for(s=1,i=1;i=n;i+)s=s*i;printf(s=%lfn,s);7.求 1！+2！+3！+ +n!的和， n 由键盘输入#includemain()int n,i;float s,f;f=1;s=0;scanf(%d,&n);for (i

4、=1;i=n;i+)f=f*i;s=s+f;printf(s=%fn,s);8.输入 100 以内能被3 整除且个位数为6 的所有整数： 6,36,66,96#includemain()int i,j;for(i=0;i10;i+)j=10*i+6;if(j%3!=0)continue;printf(%dn,j);9.求调和级数中第多少项的值大于10.：n=12367。 。p90#include#define limit 10main()int n;float sum;sum=0.0;n=1;for(;)sum=sum+1.0/n;if(sumlimit)break;n+;printf(n=%

5、dn,n);10.将一个数的各位数颠倒后输出。p84#includemain()int i,r;printf(inputan integern);scanf(%d,&i);dor=i%10;printf(%d,r);while(i/=10)!=0);printf(n);0(n=1)11.求 fibonacci 数列的前20 个数， fibonacci 数列的定义为：1(n=2)p87fn-1+fn-2(n2)#includestdio.hmain()int i,f1,f2,f3;f1=0;f2=1;printf(%10d%10d,f1,f2);for(i=3;i=20;i+)f3=f1

6、+f2;printf(%10d,f3);if(i%5=0)printf(n);f1=f2;f2=f3;printf(n);12.编程输出如图所示的九九乘法表（p88）#includemain()int m,n;for(m=1;m10;m+)for(n=1;n=m;n+)printf(%4d,m*n);printf(n);13.求 100200 间的全部素数（p92）#includemain()int m,i,n=0;for(m=101;m=200;m=m+2)if(n%10=0)printf(n);for(i=2;i=m)printf(%d,m);n=n+1;printf(nprimenumb

7、er=%dn,n);1234567891243694812165101520256121824303671421283542498162432404856649182736455463728114.试求出 1000 以内的“完全数” 。p97#includemain()int i,a,m;for(i=1;i1000;i+)for(m=0,a=1;a=i/2;a+)if(!(i%a)m=m+a;if(i=m)printf(%4d,i);15.百钱百鸡main()int x,y,z;for(x=0;x=20;x+)for(y=0;y=33;y+)z=100-x-y;if(z%3=0)&(5

8、*x+3*y+z/3=100)printf(cook=%dthen=%dt chicken=%dn,x,y,z);16.数组元素的逆序存放#include#define n 10main()intan=12,2,13,4,23,6,87,45,75,100,i,temp;for(i=0;in/2;i+)temp=ai;ai=an-i-1;an-i-1=temp;for(i=0;in;i+)printf(%4d,ai);printf(n);17.冒泡法从小到大排序。p103#includemain()int i,j,t,a9;for(i=1;i=8;i+)scanf(%d,&ai);pr

9、intf(n);for(j=1;j=7;j+)for(i=1;iai+1)t=ai;ai=ai+1;ai+1=t;for(i=1;i=8;i+)printf(%d,ai);18.比较交换法从大到小排序。p104#include#define n 6main()int i,j,t,an+1;for(i=1;i=n;i+)scanf(%d,&ai);printf(n);for(i=1;i=n-1;i+)for(j=i+1;j=n;j+)if(aiaj)t=ai;ai=aj;aj=t;for(i=1;i=n;i+)printf(%d,ai);19.选择排序法从大到小排序。p105#inclu

10、de#define n 6main()int i,j,t,k,an+1;for(i=1;i=n;i+)scanf(%d,&ai);printf(n);for(i=1;i=n-1;i+)k=i;for(j=i+1;jak)k=j;if(k!=i)t=ai;ai=ak;ak=t;for(i=1;i=n;i+)printf(%d,ai);20.求 3*3 矩阵主对角线元素之和#includemain()int a33=1,2,3,4,5,6,7,8,9,i,s;s=0;for(i=0;i3;i+)s=s+aii;printf(%dn,s);21.求 3*4 矩阵最大元素及其位置。#inclu

11、demain()int a34=1,234,5,6,7,8,1000,3,56,78,9990,23,i,j,x,y,max;max=a00;x=0;y=0;for(i=0;i3;i+)for(j=0;jmax)max=aij;x=i;y=j;printf(%d,%d,%dn,max,x,y);22.二维数组按行求平均值。#includemain()int a34=1,234,5,6,7,8,1000,3,56,78,9990,23,i,j;double s;for(i=0;i3;i+)s=3+aij;s=s/4;printf(%fn,s);23.有序数组的插入。#includemain()i

12、nt a10=0,12,17,20,25,28,x,i,n=5;scanf(%d,&x);a0=x;i=n;while(aix)ai+1=ai;i-;a+i=x;n+;for(i=1;i=n;i+)printf(%4d,ai);printf(%n);24.一个 3*4 的矩阵，要求编写程序求出第i 行、第 j 列元素的值。#includemain()int i,j;int a34=1,2,3,4,9,8,7,6,-10,10,-5,2;scanf(%d,&i);scanf(%d,&j);printf(a%d%d=%d,i-1,j-1,ai-1j-1);25.用 for

13、语句求 sum=1+2+3+4+.+100#includemain()int i,sum=0;for(i=1;i=100;i+) sum=sum+i;printf(sum=%d,sum);26.把 str1 中不是空格的数在str2 中输出#include#definen 80main() static char str1n=nice to meet you!;char str2n;int i=0,j=0;puts(str1);while(str1i)if(str1i!=)str2j+=str1i;i+;for(i=0;ij;i+)printf(%c,str2i);27.找出串中指定字符个数#includemain()char a=123asdfa123ghjlak111,c;int n=0,i;scanf(%c,&c);for(i=0;ai!=0;i+)if(ai=c)n+;printf(%dn,n);28.依次取出某字符串中所有的数字字符，形成新的字符串，并取代原字符串#includemain()char a=a123as67dfa123ghjl