C if-else Statement

Why if-else Statement?

As We've seen, the if statement allows us to run a block of code if an expression evaluates to true. If the expression evalutes to false, the code is skipped. Thus we can enhance this decision-making process by adding an else statement to an if construction. This lets us run one block of code if an expression is true, and a different block of code if the expression is false.

C if-else Syntax And Definition

• C uses the keywords if and else  to execute a set of statements either logical condition is true or false.
• If the condition is true, the statements under the keyword  if   will be executed.
• If the condition is false, the statements under the keyword else   will be executed.

Syntax if-else statement

if(condition)
{
here go statements....
}
else
{
here go statements....
}

if else Statement Flow Chart

Following flow chart will clearly explain how if else statement works

Realtime Time if else Statement Uses

Arduino microcontroller make use C programming, where you can alarm if your sensors output in greater than or lesser than expected value, else blink green light always.

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

if-else C Program

#include <stdio.h> //header file section
int main()
{
int age;
printf("Enter your age : ");
scanf("%d",&age);
if(age > 17)
{
printf("\nyou are eligible for voting ");
}
else
{
printf("\nSorry, you are not eligible for voting ");
}
printf("\nThis is normal flow ");
return 0;
}

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