整数数字之和

#include<stdio.h>int DigitSum(int n){int i,count;if(n>0){i=n%10;n=n/10;    returni+DigitSum(n);}else  return 0;}int main(){int rat=0;int a=1729;rat=DigitSum(a);printf("%d\n",rat);    return 0;}