include<stdio.h>int isprime(int n){ int i; if(n==1) return 0; for(i=2;i<n;i++) if(n%i==0) return 0; return 1; }int main(){ int sum=0; int i; for(i=3;i<=1100;i++) if(isprime(i)==1) printf("%d ",i); } ...
:标识变量*/for (i=2;i<=n/2 && flag==1;i++)if (n%i==0)flag=0;return flag ;}void main ( ){int n;printf("\nInput an integer:");scanf("%d",&n);if (prime(n))printf("\n %d is a prime.",n);elseprintf("\n %d is not a prime.",n);}[扩展...