Detailed Explanation of Digit Sum in C Language

The program to calculate the sum of digits in C can be implemented using loops and mathematical operations.

Algorithm for Sum of Digits

To write a C program to find the sum of digits, the following algorithm can be used:

• Step 1: Get a number from the user

• Step 2: Take the modulus/remainder of that number

• Step 3: Add the remainder to the total sum

• Step 4: Divide the number by 10

• Step 5: Repeat step 2 until the number is greater than 0.

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Let’s take a look at the program for sum of digits in C.

#include <stdio.h>
int main() {  int n, sum = 0, m;  printf("请输入一个数字：");  scanf("%d", &n);
  while (n > 0) {      m = n % 10;      sum = sum + m;      n = n / 10;  }
  printf("各位数字之和为：%d", sum);  return 0;}

Output:

请输入一个数字：654各位数字之和为：15
请输入一个数字：123各位数字之和为：6

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