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  1. #include <math.h>
  2.  
  3. int main() {
  4.     int a[33];
  5.     int i, j, count = 0, x;
  6.     a[0] = 2;
  7.     a[1] = -1;
  8.     for (i = 2; i <= 32; i++) {
  9.         a[i] = -a[i - 1] + a[i - 2];
  10.     }
  11.     for (i = 0; i <= 32; i++) {
  12.         if (a[i] > 1) {  
  13.             x = 1;  
  14.             for (j = 2; j <= sqrt(a[i]); j++) {
  15.                 if (a[i] % j == 0) {
  16.                     x = 0; 
  17.                      break;
  18.                 }
  19.             }
  20.             if (x=1) {
  21.                 count++;
  22.  
  23.             }
  24.         }
  25.     }
  26.  
  27.     printf("a[0] から a[32] までのうち、正の素数の個数は %d 個です。\n", count);
  28.  
  29.     return 0;
  30. }
  31.  
Success #stdin #stdout 0s 5308KB
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Standard input is empty
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a[0] から a[32] までのうち、正の素数の個数は 17 個です。
https://ideone.com/DoikI5
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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