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  1. #include<unistd.h>
  2. #include<stdio.h>
  3. #include<stdlib.h>
  4. #include<sys/wait.h>
  5. #include<sys/types.h>
  6.  
  7.  
  8. void swap(int *a , int *b)
  9. {
  10.     int temp = *a;
  11.     *a = *b;
  12.     *b = temp;
  13. }
  14. void sort_assending(int arr[] , int n )
  15. {
  16.     for(int i = 0 ; i < n - 1 ; i++)
  17.     {
  18.         for(int j = 0 ; j < n - i - 1 ; j++)
  19.         {
  20.             if(arr[j] > arr[j + 1])
  21.             {
  22.                 swap(arr + j , arr + j + 1);
  23.             }
  24.         }
  25.     }
  26. }
  27.  
  28. void sort_descending(int arr[] , int n )
  29. {
  30.     for(int i = 0 ; i < n - 1 ; i++)
  31.     {
  32.         for(int j = 0 ; j < n - i - 1 ; j++)
  33.         {
  34.             if(arr[j] < arr[j + 1])
  35.             {
  36.                 swap(arr + j , arr + j + 1);
  37.             }
  38.         }
  39.     }
  40. }
  41. int main()
  42. {   
  43.     int n;
  44.     printf("Enter number of elements in an array:\n");
  45.     scanf("%d" , &n);
  46.     int arr[n];
  47.     for(int i = 0 ; i < n ; i++)
  48.     {
  49.         printf("Enter the %dth element : " , i + 1);
  50.         scanf("%d" , &arr[i]);
  51.     }
  52.     pid_t pid;
  53.  
  54.     pid = fork();
  55.  
  56.     if(pid < 0)
  57.     {
  58.         printf("Fork failed to create a child process...!\n");
  59.         exit(1);
  60.     }
  61.     else if(pid == 0)
  62.     {
  63.       // Child process execution start from here as pid = 0
  64.       printf("Child process execution starts: sorting in descending order\n");
  65.  
  66.       sort_descending(arr , n);
  67.  
  68.       for(int i = 0 ; i < n ; i++)
  69.       {
  70.         printf("\t\t%d Child process : %d , parent id : %d\n" , arr[i] , getpid() , getppid());
  71.         // sleep(1);
  72.       }
  73.       printf("Child execution finished\n");
  74.     }
  75.     else
  76.     {
  77.  
  78.       //waiting to start child its execution
  79.      sleep(1);
  80.       // Parent execution starts from here
  81.       printf("Parent execution starts: sorting in assending order\n");
  82.  
  83.       sort_assending(arr , n);
  84.  
  85.       for(int i = 0 ; i < n ; i++)
  86.       {
  87.         printf("%d , Parent process id: %d  , child id : %d , parent id : %d\n", arr[i] , getpid() , pid , getppid());
  88.         sleep(5);
  89.       }
  90.      // wait(NULL);
  91.  
  92.      printf("Parent execution finished\n");
  93.     }
  94. }
Success #stdin #stdout 0s 5288KB
comments (?)
stdin
copy 
Standard input is empty
stdout
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Enter number of elements in an array:
Child process execution starts: sorting in descending order
Child execution finished
Enter number of elements in an array:
Parent execution starts: sorting in assending order
Parent execution finished
https://ideone.com/IJGi8u
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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