Nested If-Else Statement in C Programming

It is a conditional statement which is used when we want to check more than 1 conditions at a time in a same program. The conditions are executed from top to bottom checking each condition whether it meets the conditional criteria or not. If it found the condition is true then it executes the block of associated statements of true part else it goes to next condition to execute.

Syntax:

if(condition)
{
	if(condition)
	{
		statements;
	}
	else
	{
		statements;
	}
}
else
{
	statements;
}

In above syntax, the condition is checked first. If it is true, then the program control flow goes inside the braces and again checks the next condition. If it is true then it executes the block of statements associated with it else executes else part.

Program :

/*  Program to demonstrate nested if-else statement.
Creation Date : 09 Nov 2010 02:51:18 AM
Author : www.technoexam.com [Technowell, Sangli] */

#include <stdio.h>
#include <conio.h>

int main(void)
{
	int no;
	clrscr();
	printf("\n Enter Number :");
	scanf("%d",&no);
	if(no>0)
	{
		printf("\n\n Number is greater than 0 !");
	}
	else
	{
		if(no==0)
		{
			printf("\n\n It is 0 !");
		}
		else
		{
			printf("Number is less than 0 !");
		}
	}
	getch();
	return 0;
}

Output :

Enter Number : 0

It is 0 !_

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