C program to sum each digit: We can write the sum of digits program in c language by the help of loop and mathematical operation only.

## Sum of digits algorithm

To get sum of each digits by c program, use the following algorithm:

- Step 1: Get number by user
- Step 2: Get the modulus/remainder of the number
- Step 3: sum the remainder of the number
- Step 4: Divide the number by 10
- Step 5: Repeat the step 2 while number is greater than 0.

Let’s see the sum of digits program in C.

- #include<stdio.h>
- #include<conio.h>
- void main()
- {
- int n,sum=0,m;
- clrscr();
- printf(“Enter a number:”);
- scanf(“%d”,&n);
- while(n>0)
- {
- m=n%10;
- sum=sum+m;
- n=n/10;
- }
- printf(“Sum is=%d”,sum);
- getch();
- }

Output:

Enter a number:654 Sum is=15

Enter a number:123 Sum is=6