Program to display integer as sequence of digits and find sum of its digits

C Programming Language Recursion in c (Article) Recursion in c (Program)

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Program:

#include<stdio.h>
void display(long int n);
void Rdisplay(long int n);
int sumdigits( long int n);
main( )
{
long int num;
printf("Enter number : ");
scanf("%ld", &num);
printf("%d\n",sumdigits(num));
printf("\n");
display(num);
printf("\n");
Rdisplay(num);
printf("\n");
}/*End of main()*/

/*Finds the sum of digits of an integer*/
int sumdigits(long int n)
{
if( n/10 == 0 ) /* if n is a single digit number*/
	return n;
return n%10 + sumdigits(n/10);
}/*End of sumdigits()*/

/*Displays the digits of an integer*/
void display(long int n)
{
if( n/10==0 )
	{
	printf("%d",n);
	return;
	}
display(n/10);

printf("%d",n%10);
}/*End of display()*/

/*Displays the digits of an integer in reverse order*/
void Rdisplay(long int n)
{
if(n/10==0)
	{
	printf("%d",n);
	return;
	}
printf("%d",n%10);

Rdisplay(n/10);
}/*End of Rdisplay()*/

Output:

Enter number : 10
1

10
01
Press any key to continue . . .

Explanation:

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