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What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement

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Functions

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The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

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.

if else statement in C

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

Syntax
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

if else flow chart

Realtime Time if else Statement Uses

if else statement in real time

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.

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

Note:

x is a variable which get its input from a sensor continuously.

if-else C Program

ifelsestatement.c
#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;
}
  • Enter your age : 16
  • Sorry, you are not eligible for voting
  • This is normal flow

Note:

The user input for a variable 'age' is 16, the expression or condition tends to false. So, the else block gets executed.

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