用函数判断一个数是不是素数

Question

用函数判断一个数是否是素数，要求主函数负责输入和输出，子函数负责其他过程

Answer 1

#include<stdio.h> #include<math.h> int isPrime(int n) { if(n==1) return 0; for(int i=2;i<=sqrt(n);i++) { if(n%i==0) return 0; } return 1; } void main() { int n,flag; printf("请输入一个正整数:"); scanf("%d",&n); flag=isPrime(n); if(flag) printf("%d是素数!\n",n); else printf("%d不是素数!\n",n); }

Answer 2

#include <stdio.h> static int judge(int n){     int result;     int i;     for(i=2;i<n;i++){         if(n%i==0){           result=0;           break;         }else{           result=1;         }     }     return result; } int main(){   int num=19;   int result=judge(num);   if(result==0){     printf("%d不是素数\n",num);   }else if(result==1){     printf("%d是素数",num);   }   return 0; }

Answer 3

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