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  1. /*    main program illustrating the UNIX fork() system call. 
  2. Compile using cc -o main main.c
  3. */
  4. #include <stdio.h>
  5. int a;
  6.  
  7. void count1() {
  8.   a++;
  9.   printf("%d", a);
  10. }
  11.  
  12. void count2() {
  13.   a += 2;
  14.   printf("%d", a);
  15. }
  16.  
  17. void count3() {
  18.   a += 3;
  19.   printf("%d", a);
  20. }
  21.  
  22.  
  23. int main()
  24. {   
  25.   count1();
  26.  
  27.   int pid = fork();
  28.  
  29.   if (pid > 0) {
  30.     wait(NULL);
  31.     count2();
  32.     count1();
  33.   }
  34.   else if (pid == 0) {
  35.     count1();
  36.     count3();
  37.   }
  38.     //printf("Using fork() system call\n");
  39.     return 0;
  40. }
Success #stdin #stdout 0.01s 5288KB
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125134
https://ideone.com/GZCvfw
language:
C (gcc 8.3)
created:
10 hours ago
visibility:
public

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