统计整数的各位数字和

#include <string>
using namespace std;

int getDigitSum(int x){
    string strNum=to_string(x);
    int len=strNum.length();
    int sum=0;
    int digitPosWeight=1;       //数位的权值
    for(int i=0;i<len-1;++i){
          digitPosWeight*=10;
    }
    for(int i=0;i<len;++i){
        sum+=x/digitPosWeight;
        x=x%digitPosWeight;
        digitPosWeight/=10;
    }
    return sum;
}