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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. #include<conio.h>
  3. void main()
  4. {
  5. int n,sum=0,m;
  6. clrscr();
  7. printf(“Enter a number:”);
  8. scanf(“%d”,&n);
  9. while(n>0)
  10. {
  11. m=n%10;
  12. sum=sum+m;
  13. n=n/10;
  14. }
  15. printf(“Sum is=%d”,sum);
  16. getch();
  17. }

Output:

Enter a number:654
Sum is=15
Enter a number:123
Sum is=6
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