Unit 2 - Control Structures - Selection (If statements)

Unit#2 Control Structures - Selection (If statements)

If statements

Using these statements we can skip over a block of instructions in our program. Consider the following diagram:

#include<iostream.h>
#include<math.h>

main( )
{

Declarations of variables

Block #1 of instructions

if (Condition )
{

Block #2 of instructions

}

Block #4

}

Blocks #1 and #3 will be executed in all cases but block #2 will be executed only if the condition of the if statement is true, otherwise it will be skipped.

Note: when block #2 consists of a single statement, then the brackets are not required. The statement may be written next to if ( condition ).

Example
2ex2.appended