C++ 代码

#include<cstdio>
#include<iostream>
#include<cstring>
using namespace std;
int main()
{
    string s1;
    getline(cin,s1);
    int num = 0;
    for(char c:s1)
    {
        if(c >= '0' && c <= '9')
        num ++;
    }
    cout << num <<endl;
    return 0;
}