C program to find the sum of individual digits of a positive integer

In this article we will learn to implement a C program to find the sum of individual digits of a positive integer. A C program is provided below which reads a number and gives the sum of digits and reverse of that number.

Program is as follows:

//C program to find the sum of individual digits of a given positive integer 
//and find the reverse of a given number
#include<stdio.h>
#include<conio.h>
void main()
{
	int num,dup,sum,rev;
	printf("Enter a +ve integer: ");
	scanf("%d",&num);
	dup=num;
	sum=0;
	while(num>0)
	{
		sum+=num%10;
		num/=10;
	}
	printf("Sum of individual digits is: %d\n",sum);
	rev=0;
	while(dup>0)
	{
		rev=rev*10+(dup%10);
		dup/=10;
	}
	printf("Reverse of the given number is: %d",rev);
	getch();
}

Input and output for the above program is as follows:

Enter a +ve integer: 123
Sum of individual digits is: 6
Reverse of the given number is: 321

Suryateja Pericherla

Suryateja Pericherla, at present is a Research Scholar (full-time Ph.D.) in the Dept. of Computer Science & Systems Engineering at Andhra University, Visakhapatnam. Previously worked as an Associate Professor in the Dept. of CSE at Vishnu Institute of Technology, India.

He has 11+ years of teaching experience and is an individual researcher whose research interests are Cloud Computing, Internet of Things, Computer Security, Network Security and Blockchain.

He is a member of professional societies like IEEE, ACM, CSI and ISCA. He published several research papers which are indexed by SCIE, WoS, Scopus, Springer and others.