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  1. #include <stdbool.h>
  2. #include <stdio.h>
  3. #include <sys/types.h>
  4. #include <pthread.h>
  5.  
  6. void* compute_prime (void*);
  7.  
  8. int main() {
  9.     pthread_t thread;
  10.     int which_prime = 5;
  11.     int prime;
  12.     pthread_create(&thread,NULL,compute_prime,(void*)&which_prime);
  13.     pthread_join(&thread,(void*)&prime);
  14.     printf("The %dth prime number is : %d\n",which_prime,prime);
  15.     return 0;
  16. }
  17.  
  18. void* compute_prime (void* arg) {
  19.     int candidate = 2;
  20.  
  21.     int n = *((int*) arg);
  22.     // Stores the value of arg in n
  23.     while (1) {
  24.         bool is_prime = true;
  25.         // Here the loop tests to see if the candidate is prime
  26.         for (int factor = 2; factor < candidate; ++factor)
  27.             if(candidate%factor==0) {
  28.                 is_prime = false;
  29.                 break;
  30.             }
  31.         if(is_prime==true) {
  32.             if(--n==0)
  33.                 return (void*) candidate;
  34.         }
  35.         ++candidate;
  36.     }
  37.     return NULL;
  38. }
Success #stdin #stdout 0s 4348KB
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stdin
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Standard input is empty
stdout
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The 5th prime number is : 0
https://ideone.com/B6ebmw
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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