problem not solving-five digit number input through key board ,write program to calculate sum of its digits

int main()

{

     int num, i, rev_num;

     printf("Enter a four digit number:");

     scanf("%d",&num);

     printf("You entered :%d",num);     

     i = num % 10;

     rev_num = i * 1000;

     num = num / 10;

     i = num % 10;

     rev_num = rev_num + i * 100;

     num = num / 10;

     i = num % 10;

     rev_num = rev_num + i * 10;

     num = num / 10;

     i = num % 10;

     rev_num = rev_num + i * 1;

     printf("Reverse number %d",rev_num);

     getch();

 }

Dear. Mr. Parveen.

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