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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     int a,i,s;
  5. s=1;
  6.     printf("正の整数を入力してください: ");
  7.     scanf("%d", &a);
  8.  
  9.  
  10.  
  11.         for (i = 2; i * i <= a; i++) {
  12.             if (a % i == 0) {
  13.                 s = 0;
  14.  
  15.             }
  16.         }
  17.  
  18.  
  19.     if (s)
  20.         printf("素数です\n");
  21.     else
  22.         printf("素数ではありません\n");
  23.  
  24.     return 0;
  25. }
Success #stdin #stdout 0s 5324KB
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正の整数を入力してください: 素数ではありません
https://ideone.com/Lo4wTb
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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