problem 2.c

北大青鸟软件工程师ppt的学生用书源代码

# include <stdio.h>

void main()
{
	int n, sum=0, right_digit;
	printf("\n请输入一个正数： ");
	scanf("%d",&n);

	do /* do...while 循环开始 */
	{
		right_digit = n % 10;
		sum += right_digit; /* sum = sum + right_digit*/
		n /= 10; /* n = n / 10 */
	}
	while (n>0); /* do...while 循环结束 */
	printf ("\n各位数字之和是：%d\n",sum);
}