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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.     int a;
  5.     int b = 0; 
  6.  
  7.     scanf("%d", &a);
  8.  
  9.     for (int i = 2; i <= a - 1; i++) {
  10.         if (a % i == 0) {
  11.             b++;
  12.         }
  13.     }
  14.  
  15.     if (b == 0 && a > 1) { 
  16.         printf("%dは素数です\n", a);
  17.     } else {
  18.         printf("%dは素数ではありません\n", a);
  19.     }
  20.  
  21.     return 0;
  22. }
  23.  
Success #stdin #stdout 0.01s 5320KB
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stdin
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3
stdout
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3は素数です
https://ideone.com/ogg6vR
language:
C (gcc 8.3)
created:
23 hours ago
visibility:
public

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