>I want to ensure that the user puts in a name with characters and not use numbers.
Why? Numbers would be a valid string, and forcing your players to enter alphabetic characters may be an unnecessary restriction. Especially since it requires more work and code from you, and therefore more debugging and possible errors.
However, to do it you can use the standard library:
#include <algorithm>
#include <cctype>
#include <cstring>
#include <functional>
#include <iostream>
using namespace std;
int alpha ( int c )
{
return isalpha ( c );
}
void getname ( char s[], int n )
{
while ( cin.getline ( s, n )
&& *find_if ( s, s + strlen ( s ), not1 ( ptr_fun ( alpha ) ) ) != '\0' )
{
cout<<"No digits allowed. Try again: ";
}
}
Though it's a little awkward using C-style strings. If you were using std::strings then it would be much easier:
#include <iostream>
#include <string>
using namespace std;
void getname ( string& s )
{
while ( getline ( cin, s )
&& s.find_first_of ( "0123456789" ) != string::npos )
{
cout<<"No digits allowed. Try again: ";
}
}
To do it manually you can use isalpha in a loop (a C-style solution), but the code is longer and harder to get right:
#include <cctype>
#include <iostream>
using namespace std;
void getname ( char s[], int n )
{
while ( cin.getline ( s, n ) ) {
char *p = s;
while ( *p != '\0' ) {
if ( !isalpha ( *p ) ) {
cout<<"No digits allowed. Try again: ";
break;
}
++p;
}
if ( *p == '\0' )
break;
}
} I'm a programmer. My attitude starts with arrogance, holds steady at condescension, and ends with hostility. Get used to it.
