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  1. #include <stdio.h>
  2. #include <unistd.h>
  3. #include <sys/wait.h>
  4. #include <stdlib.h>
  5. #include <stdbool.h>
  6.  
  7. bool is_prime(int num) {
  8.     if (num <= 1) return false;
  9.     for (int i = 2; i <= num / 2; i++) {
  10.         if (num % i == 0) return false;
  11.     }
  12.     return true;
  13. }
  14.  
  15. int main() {
  16.     pid_t pid1, pid2, parent_pid;
  17.  
  18.     parent_pid = getpid();
  19.  
  20.     pid1 = fork();
  21.  
  22.     if (pid1 == 0) {
  23.         // Child Process 1
  24.         int child1_pid = getpid();
  25.         if (is_prime(child1_pid)) {
  26.             printf("Child 1 (PID %d): My PID is a prime number.\n", child1_pid);
  27.         } else {
  28.             printf("Child 1 (PID %d): My PID is not a prime number.\n", child1_pid);
  29.         }
  30.         exit(0);
  31.     } else {
  32.         pid2 = fork();
  33.  
  34.         if (pid2 == 0) {
  35.             // Child Process 2
  36.             if (is_prime(parent_pid)) {
  37.                 printf("Child 2 (PID %d): My parent's PID (%d) is a prime number.\n", getpid(), parent_pid);
  38.             } else {
  39.                 printf("Child 2 (PID %d): My parent's PID (%d) is not a prime number.\n", getpid(), parent_pid);
  40.             }
  41.             exit(0);
  42.         } else {
  43.             // Parent Process
  44.             wait(NULL);
  45.             wait(NULL);
  46.             printf("Parent (PID %d): Missions accomplished...\n", parent_pid);
  47.         }
  48.     }
  49.     return 0;
  50. }
  51.  
Success #stdin #stdout 0s 5280KB
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stdin
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Standard input is empty
stdout
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Child 2 (PID 1009175): My parent's PID (1009171) is not a prime number.
Child 1 (PID 1009174): My PID is not a prime number.
Parent (PID 1009171): Missions accomplished...
https://ideone.com/MIycWc
language:
C (gcc 8.3)
created:
333 days ago
visibility:
public

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