C if statement

Why if Statement?

All programming languages enable you to make decisions. They enable the program to follow a certain course of action depending on whether a particular condition is met. This is what gives programming language their intelligence.

C if Syntax And Definition

• C uses the keyword if to execute a set of statements when logical condition is true.
• When the logical condition is false, the compiler simply skips the statement within the block.
• The "if" statement is also known as one way decision statement.

Syntax if statement

if(condition)
{
here goes statements;
.
.
.
.
here goes statements;
}

if Statement Uses

if statements are commonly used in following scenarios

• Is A bigger than B?
• Is X equal to Y?
• Is M not equal to N?

Realtime Time if Statement Uses

Arduino microcontroller make use C programming, where you need to blink a warning light(red light) when certain condition met. Example program is as below:

if(x = 123)
digitalWrite(LEDpin, high)

if Statement Rules

• The expression (or) condition is always enclosed within pair of parenthesis. e.g.) if ( a > b )
• The if statement should not be terminated with a semicolon. If it happens, the block of statements will not execute even the condition is true.
• The statements following the if condition is normally enclosed between 2 braces (in curly braces).

if statement Flow Chart

Following flow chart will clearly explain how if statement works

if statement C Program

#include <stdio.h> //header file section
#include <conio.h>
int main()
{
int age = 18;
if(age > 17){
printf("you are eligible for voting ");
}
printf("\nThis is normal flow ");
return 0;
}

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