C++_Language Tutorials Page 4


	Software Development C++ Language Setting Up Your Compiler Hello World Program and Libraries Variables and Expressions If and Switch Case Statements While and For Loops Functions Classes, Structures, and Unions Arrays and Pointers Reading From a File Socket Networking Advanced Structures Extra Resources OpenGL Graphics Setting Up Your Compiler Setting Up a Window Perspective and Orthographic Projections Rendering Objects Animating Objects Basic Texturing Basic Lighting Handling Input Advanced Texturing and Lighting The OpenGL Shading Language Game Programming Collision Detection and Response Loading a Model Loading a Texture Extra Resources Artificial Intelligence Brute Force Method Simple AI: Path Finding Swarm AI Neural Networks Feed Forward Networks Recurrent Networks Interpreting the Output Ways to Learn The Cost Function Operating Systems Development Setting Up Your Compiler Booting Simple Video Memory Managing Random Access Memory Extra Resources Web Development PHP Language

C++ Language Tutorial Page 4 If Statements and Switch Case Statements Ned Bingham Previous Index Next If Statements If statements are pretty simple, if the test boolean expression returns true or one, it executes a segment of code. If the test boolean expression returns false, then it goes on to the next iterated if which is an else if and if there is no else if, then else covers everything else.
The syntax is as follows: (If you only have one line of code, you dont need the curly brackets.)

if (boolean expression)
{
	 code goes here... 
}
else if (boolean expression)
{
	 more code... 
}
               .
	       .
	       .
	       .
else if (boolean expression)
{
	 more code... 
} 
else
{
	 even more code... 
}

Switch Case Statements Switch case statements are very similar to if statements, except the are a little more specific. Instead of a very general boolean expression, they check whether one variable is equal to many different possibilities. For example, you have an integer a. case 1: is essentially if (a == 1). Here is the syntax.

switch (a)
{
	case 1:
		code goes here...
		break;
	case 2:
                more code goes here...
                break;
	case 3:
                even code goes here...
                break;
	case 4:
                more than even more code goes here...
                break;
	default:
		this handles every other possible case...
		break;
}

This can be done with any variable type, not just integers. This becomes especially useful when you have to check a ton of values. The keyword break just tells the compiler to break out of the current curly brackets. In this case it would break out of the switch statement. However, you can use that anywhere.