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  1. #include <stdio.h>      // printf()
  2. #include <stdlib.h>     // rand()
  3. #include <unistd.h>     // fork(), usleep()
  4. #include <sys/wait.h>   // wait()
  5.  
  6. int main() {
  7.     printf("A\n");
  8.     if (fork() == 0) {
  9.         usleep((rand() % 5 + 1) * 100000); // wait for a random time
  10.         printf("B\n");
  11.         if (fork() == 0) {
  12.             usleep((rand() % 5 + 1) * 100000);
  13.             printf("C\n");
  14.         } else {
  15.             wait(NULL);
  16.             printf("D\n");
  17.         }
  18.     } else {
  19.         usleep((rand() % 5 + 1) * 100000);
  20.         printf("E\n");
  21.         wait(NULL);
  22.     }
  23.     return 0;
  24. }
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin
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Standard input is empty
stdout
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A
B
C
A
B
D
A
E
https://ideone.com/WZjwcX
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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