[Slice]

-1 is not numeric!



Also, why would you keep looping if you find an invalid number?

Proper version would be (I stole this from myself):

pawn Код:

stock bool:IsValidNumber( const szString[ ] )
{
    if ( !szString[ 0 ] )
        return false;
    
    new
        iLength = strlen( szString ),
        i
    ;
    
    if ( szString[ 0 ] == '-' && szString[ 1 ] )
        i = 1;
    
    for ( ; i < iLength; i++ )
    {
        if ( !( '0' <= szString[ i ] <= '9' ) )
            return false;
    }
    
    return true;
}