Programming Example
Program to display integer as sequence of digits and find sum of its digits
Program to display integer as the sequence of digits and find the sum of its digits
#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()*/Enter number : 10
1
10
01
Press any key to continue . . .
First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.
After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.