looking for info about operators "?" and ":"

[Leonid]

Hello all :)
could anyone give a guide, ebook etc.. about the operators "?" and ":"
thanks in advance
Leonid

[r035198x]

Hello all :)
could anyone give a guide, ebook etc.. about the operators "?" and ":"
thanks in advance
Leonid

You don't need a book for those. That is just the short form for the if-else

int x = 5;
(x > 3) ? cout<<"greater than 3":cout<<"no";
//if(x >3)cout<<"greater than 3"; else cout<<"no";

play around with them on the compiler

[Leonid]

You don't need a book for those. That is just the short form for the if-else

int x = 5;
(x > 3) ? cout<<"greater than 3":cout<<"no";
//if(x >3)cout<<"greater than 3"; else cout<<"no";

play around with them on the compiler

thank you very much!

[Leonid]

sorry for the double postng' my limit for editing has exceed...

I got an error while writing this

#include <iostream.h>
#include <conio.h>

void main(void)
{
int a,b;
while(1)
{
cout<<"type 'e' for exit";
(getch()=='e')? break:continue;
cin>>a>>b;
(a>b)? cout<<""<<a<<endl:cout<<""<<b<<endl:cout<<"even"<< endl;
}
}

I got two errors
the first one was after the break
and the second was before the third condition.

thanks in advance
Leonid

[horace1]

The conditional operator ? is a ternary operator (it has three operands) in which the operands are three expressions. It takes the following general form:
expression1 ? expression2 : expression3

For example, consider the following if statement:

    if (x >= 0)  z = cos(x); else z = sin(x);
 

This may be written:

     z = (x >= 0) ? cos(x) : sin(x);
 

However, the following will not work

  (getch()=='e')? break:continue;
 

because break and continue are statements and cannot be part of an expression.
The comiler will give an error message such as "expected primary-expression before break"