哪个高手告诉我用C语言怎么编“从键盘上输入一个正整数N，计算该数的各位数字之和并输出”这个题

#include <stdio.h>

int main()
{
printf("Please enter a integer: ");
int iInput;
scanf("%d", &iInput);

int iSum = 0;
int itemp = iInput;
while(itemp > 0)
{
iSum += itemp % 10;
itemp /= 10;
}

printf("Sum of each digit in number %d is %d.", iInput, iSum);
}

#include"stdio.h"
void main()
{
int num,m=0;
printf("please input a number:");
scanf("%d",&num);
do
{
m+=num%10;
num/=10;
}
while(num!=0);
printf("the answer is:%d\n",m);
}
这些基础的题目希望楼主能独立完成,学一学这些题的算法