Geeksforgeeks Solution For " Remove characters from alphanumeric string "

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Problem :- Remove all characters from an alphanumeric string.

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Solution :-

#include <iostream>
#include <cstring>
#include <cstdlib>
using namespace std;
int main()
{
    int t;
    cin>>t;
    while(t--)
    {
       string str;
       int i,j,len;
       cin>>str;
       len=str.length();
       for(i=0;i<len;i++)
       {
           if(str[i]>=48 && str[i]<=57)
           {
               cout<<str[i];
           }
       }
       cout<<endl;

    }
    return 0;
}

Output:-