C语言简单的23个例子.doc

例1.1：输入两个数，输出其中的最大者方法一：#include stdio.hint main()int a,b,max;scanf(%d %d,a,b);if (ab) max=a;else max=b;printf(%dn,max);return 0;方法二：#includestdio.hint main()int m,n;scanf(%d %d,m,n);printf(%dn,(mn)?m:n);return 0;例1.2：输入三个数，输出其最大者#include stdio.hint main()int a,b,c;scanf(%d %d %d,a,b,c);printf(%dn,ab?(ac?a:c):(bc?b:c);return 0;例2：求一个数的绝对值方法一：#include stdio.hint main()int a,absa;printf(enter one number:n);scanf(%d,a);if (a0)absa=-a;else absa=a;printf(|%d|=%dn,a,absa);return 0;方法二：#includestdio.h#includemath.hint main()int a;scanf(%d,a);printf(%dn,abs(a);return 0;例3：两个数的四则运算#include stdio.hint main()double x,y; char op;printf(输入运算式:n);scanf(%lf%c%lf,x,op,y);switch (op)case +:printf(%.2f%c%.2f=%.2fn,x,op,y,x+y);break;case -:printf(%.2f%c%.2f=%.2fn,x,op,y,x-y);break;case *:printf(%.2f%c%.2f=%.2fn,x,op,y,x*y);break;case /:if (y=0)printf(error!n);else printf(%.2f%c%.2f=%.2fn,x,op,y,x/y);break;default :printf(expression is error!n);return 0;例4：求N个数的平均数，以-1结束输入，且-1不纳入计算#include stdio.hint main()int n=0;double a,sum=0;while(1)scanf(%lf,a);if(a=-1) break;sum+=a;n+;printf(%.2fn,sum/n);return 0;例5：打印出九九乘法口诀#include stdio.hint main()int i,j;for (i=1;i10;i+) for(j=i;j10;j+)printf(%dx%d=%-4d,i,j,i*j);printf(n);return 0;例6：大小写转换，以数字0结束输入#include stdio.hint main()char ch;while(1)scanf(%c,ch);if(ch=0) break;if(ch=Ach=Z) printf(%cn,ch+32);if(ch=ach=z) printf(%cn,ch-32);return 0;例7：打印菱形图案#include stdio.hint main()int i,j,k;for (i=0;i10;i+)for (j=0;j=9-i;j+)printf( );for (k=0;k=2*i;k+)printf(%c,3);printf(n);for (i=0;i=9;i+)for (j=0;j=i+1;j+)printf( );for (k=0;k=16-2*i;k+)printf(%c,3);printf(n);return 0;例8：求100以内所有的素数#include stdio.h#include math.hmain()int m,i,k,t=0,j=1,n=0;printf(%3d:,j);for (m=2;m=300;m=m+1)k=(int)sqrt(m);for (i=2;i=k;i+)if(m%i=0)break;if(i=k+1)printf(%5d,m);t+;if(t%4=0) printf(n%3d:,+j);printf(n);return 0;例9：输出Fibonacci数列的前20项及其和（Fibonacci数列：1,1,2,3,5,8,13,21）#include stdio.hint main()int i,sum=0,f20=1,1;for (i=2;i20;i=i+1)fi=fi-1+fi-2;for (i=0;i20;i=i+1)printf(%6d,fi);sum=sum+fi;if (i+1)%4=0) printf(n);printf(sum=%dn,sum);return 0;例10：输出各位数均不相同的三位数，及其个数#include stdio.hint main()int n,i,j,k;n=0;for (i=1;i=9;i+)for (k=1;k=9;k+)if (k!=i)for (j=0;j=9;j+)if(j!=ij!=k)n+;printf(%d ,100*i+10*j+k);if (n%10=0) printf(n);printf(n);printf(共%d个数n,n);return 0;例11：输入一个数，求其阶乘#include stdio.hint main()int i,s,n;printf(n=);scanf(%d,n);i=1;s=2;while (i=n)s=s*i;i=i+1;printf(%d!=%dn,n,s);return 0;例12：将一个数分解质因数#includestdio.hint main()int i,n;printf(please input numbers:n);for(;)scanf(%d,n);printf(%d=,n);for(i=2;i=n;i+)while(n!=1)if(n%i=0) printf(%d*,i);n=n/i;else break;if(n=1) printf(b n);else printf(%dn,n);return 0;例13：汉诺塔游戏#includestdio.hvoid move(char a,char b)static int i=0;printf(%c-%c %dn,a,b,+i);void hanoi(int m,char a,char b,char c)if(m=1) move(a,c);elsehanoi(m-1,a,c,b);move(a,c);hanoi(m-1,b,a,c);int main()int m;printf(请输入方块数：);scanf(%d,m);hanoi(m,A,B,C);return 0;例14：求一句话中单词的个数#includestdio.hint main()char s100,c;int i,temp=0,num=0;gets(s);for(i=0;(c=si)!=0;i+)if (c= ) temp=0;else if (temp=0)num=num+1;temp=1;printf(%dn,num);return 0;例15：水仙花数（三位数，各位数字的三次方之和等于该数）方法一：#include stdio.hint main()int i,j,z,n;for (n=100;n1000;n+)i=n/100;j=n/10-10*i;z=n%10;if(n=i*i*i+j*j*j+z*z*z)printf(%5d,n);printf(n);return 0;方法二：#includestdio.hint main()int i,j,k;for(i=1;i=9;i+)for(j=0;j=9;j+)for(k=0;k=9;k+)if(i*i*i+j*j*j+k*k*k=100*i+10*j+k)printf(%4d,100*i+10*j+k);printf(n);return 0;例16：字符串b在字符串a中出现的次数，b中可以用“？”代替未知字母#includestdio.h#define N 1000int main()int i,j,m,n,k,x=0;char aN,bN;gets(a);gets(b);for(i=0;ai!=0;i+);for(j=0;bj!=0;j+);m=i-;n=j-;for(i=0;i=m-n+1;i+)k=0;for(j=0;jn;j+)if(bj=?) k=1;continue;else if(ai+j=bj) k=1;else k=0;if (k) x+;printf(%dn,x);return 0;例17：冒泡排序#include stdio.h#define N 10int main()int i,j,t,max,aN=1,1,2,3,15,28,133,21,34,777;int x;printf(初始数组元素为:);for (i=0;iN;i+)printf(%d ,ai);printf(n);for (i=0;iN-1;i+)for (j=0;jN-i-1;j+)if (ajaj+1)t=aj;aj=aj+1;aj+1=t;printf(从小到大排序后的数组为:);for (i=0;iN;i+);printf(%3d,ai);return 0;例18：选择排序#include stdio.h#define N 10int main()int i,t,j,max,aN=1,1,2,3,15,28,133,21,34,777;int x;printf(初始数组元素为:);for (i=0;iN;i+)printf(%d ,ai);printf(n);for (i=0;iN-1;i+)t=i;for (j=i+1;iN;j+)if (ajat) t=j;if (t!=i) x=at;at=ai;ai=x;printf(从小到大排序的数组为:);for (i=0;iN;i+)printf (%d,ai);printf(n);return 0;例19：数组元素的插入#include stdio.h#define N 10int main()int i,j,aN=1,1,2,3,15,28,133,21,34;int x;printf(初始数组元素为:);for (i=0;iN;i+)printf(%d ,ai);printf(n);printf(请输入要插入的下标位置（0-%d）:,N-1);scanf(%d,i);printf(请输入要插入的数:);scanf(%dn,x);for (j=N-1;ji;j-)aj=aj-1;ai=x;printf(插入元素之后的数组为:);for (i=0;iN;i+)printf(%4d,ai);printf(n);return 0;例20：数组元素的删除#include stdio.h#define N 10int main()int i,j,aN=1,1,2,3,15,28,133,21,34,88;int x;printf(初始数组元素为:);for (i=0;iN;i+)printf(%d ,ai);printf(n);printf(请输入要删除的下标位置（0-%d）,N-1);scanf(%d,i);for (j=i+1;jN;j+)aj-1=aj;printf(删除后的数组为:);for (i=0;iN;i+)printf(%4d,ai);printf(n);return 0;例21：数组中的最大值#include stdio.h#define N 10int main()int i,max,aN=1,1,2,3,15,28,133,21,34,777;int x;printf(初始数组元素为:);for (i=0;iN;i+)printf(%d ,ai);printf(n);max=a0;for (i=1;iN;i+)if (ai=max) max=ai;printf(数组的最大值是%dn,max);return 0;例22：数组中最大值的下标#include stdio.h#define N 10int main()int i,max,aN=1,1,2,3,15,28,133,21,34,777;int x;printf(初始数组元素为:);for (i=0;iN;i+)printf(%d ,ai);printf(n);max=0;for (i=1;iN;i+)if (ai=amax) max=i;printf(数组的最大值的下标是%dn,max);return 0;例23：查找