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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 main()
  6. {
  7.   int pid1,pid2,pid3;
  8.   printf("A ");
  9.   pid1=fork();
  10.   if(pid1==0)
  11.   {
  12.   	  printf("B ");
  13.   	  pid2=fork();
  14.   	  if(pid2==0)
  15.   	  {
  16.   	  	printf("B ");
  17.   	  }
  18.   	  else
  19.   	  {
  20.   	  	if(fork()==0){
  21.   	  	printf("C ");
  22.  
  23.   	  	}
  24.   	  }
  25. printf("A ");
  26.   }
  27. else{
  28. 	pid3=fork();
  29. 	if(pid3==0)
  30. 	{
  31. 		printf("D ");
  32. 		if(fork() && fork())
  33. 		{
  34. 			printf("B ");
  35. 			fork();
  36. 			printf("D ");
  37. 		}
  38. 	}
  39. 	else{
  40. 		printf("A ");
  41. 	}
  42.  
  43. }
  44.     return 0;
  45. }
  46.  
Success #stdin #stdout 0.01s 5280KB
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A A
https://ideone.com/JjggFt
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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