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1、判断是否为润年的软件：输入三个数为之从小到大排序：#includevoid main()int a,b,c,t;scanf(%d%d%d,&a,&b,&c);if(ab)t=a;a=b;b=t;if(bc)t=b;b=c;c=t;if(ac)t=a;a=c;c=t;printf (%d%d%d,a,b,c);分段函数软件：#includevoid main()double x,y;scanf(%lf,&x);if (x0)y=x+2;else if(x=0)y=x;else y=x-2; printf(%lf,y);条件如输入一个数学成绩判断等级软件：#includevoid main()do
2、uble grade;scanf(%lf,&grade);if(grade100|grade=90)printf(A);else if(grade=80)printf(B);else if(grade=70)printf(C);else if(grade=60)printf(D);else printf(E);从1加到100软件：#includevoid main()int sum,i;sum=0;i=0;while(i=100) sum+=i; i+;printf(sum=%d,sum);判断一个数是否为素数#includevoid main()int i,n;printf(please i
3、nput a munbern);scanf(%d,&n);for(i=2;in-1;i+)if(n%i=0)printf(the number is not a primen);break; if(i=n) printf(the number is a primen);或者：#include#includevoid main()int i,n,flag=1;printf(please input a munbern);scanf(%d,&n);for(i=2;i=sqrt(n);i+)if(n%i=0)flag=0;break;if(flag=0) printf(the number is n
4、ot a primen);else printf(the number is a primen);请输入一个整数：不是素数#include#includevoid main()int i,n,flag=1;printf(请输入一个整数：n);scanf(%d,&n);for(i=2;i=sqrt(n);i+)if(n%i=0)flag=0;break;if(flag=0) printf(不是素数n);else printf(是素数n);#include#includevoid main()int i,n,flag=1;printf(请输入一个整数：n);scanf(%d,&n);for(i=2
5、;i=sqrt(n);i+)if(n%i=0)flag=0;break;if(flag=0)printf(不是素数,他的一个因数是);else printf(是素数n);if(flag=0)printf(%dn,i);输入输出软件（全局变量）；#includeint a10;void arrin()int i;for(i=0;i10;i+)scanf(%d,&ai);void arrout()int i;for(i=0;i10;i+)printf(%3d,ai);printf(n);void main()arrin();arrout();（局部变量）：#includevoid arrin(in
6、t *p)int i;for(i=0;i10;i+)scanf(%d,&pi);void arrout(int *q)int i;for(i=0;i10;i+)printf(%3d,qi);printf(n);void main()int a10;arrin(a);arrout(a);定义一个十五个元素数组（1）随机赋值（2）输出数组元素（3）每三个数求和（4）输出和值#include#includevoid arrin(int *p)/定义产生随机数函数int i; for(i=0;i15;i+)pi=rand()%10;/&pivoid arrout(int *q,int n)/定义输出函
7、数int i;for(i=0;in;i+)printf(%3d,qi);void Sum(int *p,int *q)/定义三数求和函数int i,sum,j;printf(n);sum=0;j=0;for(i=0;i15;i+)sum+=pi;if (i+1)%3=0)qj=sum;j+;sum=0;void main()int a15,b5;arrin(a);/&a0arrout(a,15);Sum(a,b);arrout(b,5);printf(n);例5：对一个数组倒序存放，只借助一个临时空间：#include#includevoid arrin(int *p)/定义产生随机数函数in
8、t i; for(i=0;i15;i+)pi=rand()%10;/&pivoid arrout(int *q,int n)/定义输出函数int i;for(i=0;in;i+)printf(%3d,qi);void exc(int *p)/定义交换函数int i,temp;for(i=0;i15/2;i+)temp=pi;pi=p14-i;p14-i=temp;void main()int a15;arrin(a);/&a0arrout(a,15);printf(n);exc(a);arrout(a,15);printf(n);数组中每个值在09之间；统计50个数字每个整数的个数：#incl
9、ude#includevoid arrin(int *p)/定义产生随机数函数int i; for(i=0;i50;i+)pi=rand()%10;/&pivoid arrout(int *q,int n)/定义输出函数int i;for(i=0;in;i+)printf(%3d,qi);if(i+1)%10=0)printf(n);void sta(int *p,int*q)/定义统计函数int i;for(i=0;i50;i+)qpi+;void main()int a50,b10=0;arrin(a);/&a0arrout(a,50);printf(n);sta(a,b);arrout(b,10);printf(n);例题：打印雪花：、#includevoid main()int i,j,t;for(i=1;i=4;i+)for(j=1;j=4-i;j+)printf( );for(t=1;t=2*i-1;t+)printf( *);for(j=1;j=4-i;j+)printf( );printf(nn);for(i=1;i=3;i+)for(j=1;j=i;j+)printf( );for(t=1;t=7-2*i;t+)printf( *);for(j=1;j=i;j+)printf( );printf(nn);