Numeric values:


public bool isNumeric(string str) {
Regex pattern = new Regex("[^0-9]");
return !pattern.IsMatch(str);
}


Alfa values:


private bool IsAlpha(string str) {
Regex pattern = new Regex("[^a-zA-Z]");
return !pattern.IsMatch(str);
}


Alfa numeric values:

private bool isAlfaNumeric(string str) {
Regex pattern = new Regex("[^a-zA-Z0-9]");
return !pattern.IsMatch(str);
}


When I write some console application in Bloodshed Dev C++ or Visual Studio, I hate bringing up comand line and typing in the whole path to the program I’ve just written. I found two short ways of having “Press any key to continue…” before the console window disappears. One of them is a good one and the other is bad.

1. Good one

int main()

cout<<"Press Enter to continue...";
cin.get();
}


Well, this one really is "Press Enter to continue...", which shouldn't be a problem

2. Bad one

int main()
{

system.("PAUSE");
}

This one is very bad! If you want to know why, read this article:

http://www.gidnetwork.com/b-61.html

#include

int main()
{
// do something
delay(5);
// delays 5 seconds
}


I wrote this little function which converts integer type variable to string. Always very handy!


#include

string toString(int n)
{
string str;
stringstream out;
out<
return str = out.str();
}