题解 | 数位之和

#include <stdio.h>

int main()
{
	int ret = 0;
	int n = 0;
	scanf("%d", &n);
	while (n)
	{
		if (n < 0)
			n = -n;
		ret=ret+(n%10);
		n = n / 10;
	}
	printf("%d", ret);
	return 0;
}