Sum of digits program in C

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.

1. #include<stdio.h>  
2.  int main()    
3. {    
4. int n,sum=0,m;    
5. printf("Enter a number:");    
6. scanf("%d",&n);    
7. while(n>0)    
8. {    
9. m=n%10;    
10. sum=sum+m;    
11. n=n/10;    
12. }    
13. printf("Sum is=%d",sum);    
14. return 0;  
15. }   

Output:

Enter a number : 654

Sum is = 15

Enter a number : 123 

Sum is = 6