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  1. #include <stdio.h>
  2.  
  3. int check(int n) {
  4.     for (int x = 2; x < n; x++) {
  5.         if (n % x == 0) {
  6.             return 0;
  7.         }
  8.     }
  9.     return 1;
  10. }
  11.  
  12. int main(void) {
  13.     int a;
  14.     scanf("%d", &a);
  15.  
  16.     for (int x = 2; x < a; x++) {
  17.         int c = a - x;
  18.  
  19.         if (check(x) && check(c)) {
  20.             printf("%d + %d = %d\n", x, c, a);
  21.             break;
  22.         }
  23.     }
  24.  
  25.     return 0;
  26. }
Success #stdin #stdout 0.16s 5312KB
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https://ideone.com/gXvpJS
language:
C (gcc 8.3)
created:
6 hours ago
visibility:
public

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