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  1. #include <stdio.h>
  2.  
  3. int checkP (int n)
  4. {
  5.     for (int i=2; i<n; i++)
  6.         if(n%i==0)
  7.             return (0);
  8.     return (1);
  9. }
  10.  
  11. int nextP (int n)
  12. {
  13.     do
  14.      n++;
  15.     while (!checkP(n));
  16.     return n;
  17. }
  18.  
  19. int main ()
  20. {
  21.   int x = 34;  //user input
  22.     for (int i = 2; i < x - 1; i = nextP(i))
  23.     {
  24.      if (checkP(x - i)) {
  25.             printf ("\n %d + %d", i, x-i);
  26.         }
  27.     }
  28. }
Success #stdin #stdout 0s 4580KB
comments (?)
stdin
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Standard input is empty
stdout
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 3 + 31
 5 + 29
 11 + 23
 17 + 17
 23 + 11
 29 + 5
 31 + 3
https://ideone.com/jAIfa2
language:
C99 (gcc 8.3)
created:
5 years ago
visibility:
secret

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