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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     int a[101] = {0}; 
  5.  
  6.     for (int i = 2; i <= 50; i++) {
  7.         for (int j = i * 2; j <= 100; j += i) {
  8.             a[j]++;  // 倍数の位置に +1
  9.         }
  10.     }
  11.  
  12.     printf("100以下の素数:\n");
  13.     for (int i = 2; i <= 100; i++) {
  14.         if (a[i] == 0) {
  15.             printf("%d ", i);
  16.         }
  17.     }
  18.     printf("\n");
  19.  
  20.     return 0;
  21. }
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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100以下の素数:
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
https://ideone.com/usjIxa
language:
C (gcc 8.3)
created:
9 days ago
visibility:
public

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