c++ string

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#include <iostream> #include <cctype>#include <string>using namespace std;int main() {     char next;    string message="All good!\n";    cin.get(next);    while (cin.get(next) && (next != ‘\n‘)) {        if (! isdigit(next))             message = "There‘s a non-number in here! \n";    }    cout << message << endl;    return 0; }#include <cstdlib>#include <string>#include <iostream>using namespace std;int main() {     char next;    string setofnums = "0123456789";    string email;    cin >> email;    if (email.find_first_not_of(setofnums) != string::npos)         cout << "There‘s a non-number in here! \n";    else        cout << "All good!\n";    return 0; }

 

c++ string