C++ 数字总和程序

#include <iostream>
using namespace std;
int main()
{
int n,sum=0,m;  
cout<<"Enter a number: ";  
cin>>n;  
while(n>0)  
{  
m=n%10;  
sum=sum+m;  
n=n/10;  
}  
cout<<"Sum is= "<<sum<<endl;  
return 0;
}

Enter a number: 23  
 Sum is= 5

Enter a number: 624       
Sum is= 12