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  1. #include <stdio.h>
  2. #include <unistd.h>
  3. #include <sys/types.h>
  4. #include <sys/wait.h>
  5.  
  6. void sum_of_digits()
  7. {
  8.     int num, sum = 0, rem;
  9.  
  10.     printf("Enter the number: ");
  11.     fflush(stdout);  // Flush output before input
  12.     scanf("%d", &num);
  13.  
  14.     while (num != 0) {
  15.         rem = num % 10;
  16.         sum += rem;
  17.         num /= 10;
  18.     }
  19.  
  20.     printf("Sum of Digits: %d\n", sum);
  21. }
  22.  
  23. int main()
  24. {
  25.     pid_t c1, c2;
  26.  
  27.     c1 = fork();
  28.  
  29.     if (c1 == 0) {
  30.         printf("Happy new year\n");
  31.         return 0;
  32.     }
  33.     else {
  34.         c2 = fork();
  35.  
  36.         if (c2 == 0) {
  37.             sum_of_digits();
  38.             return 0;
  39.         }
  40.         else {
  41.             wait(NULL);
  42.             wait(NULL);
  43.             printf("Parent exiting …good bye....\n");
  44.         }
  45.     }
  46.  
  47.     return 0;
  48. }
  49.  
Success #stdin #stdout 0.01s 5320KB
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stdin
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123
stdout
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Enter the number: Sum of Digits: 6
Happy new year
Parent exiting …good bye....
https://ideone.com/3XZiq6
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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