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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.     int n = 100;
  5.     int count = 0;
  6.     int i, j, is_prime;
  7.     for (i=n; i>=2; i--) {
  8.         is_prime = 1;
  9.         for (j=2; j<i; j++){
  10.             if(i%j == 0) {
  11.                 is_prime = 0;
  12.                 break;
  13.             }
  14.         }
  15.         if(is_prime == 1) count++;
  16.     }
  17.     printf("%d以下の素数は%d個ある\n", n, count);
  18.     return 0;
  19. }
Success #stdin #stdout 0.01s 5284KB
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100以下の素数は25個ある
https://ideone.com/NsGSJ9
language:
C (gcc 8.3)
created:
6 hours ago
visibility:
public

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