What is Nested if-else with an example:

A nested if-else statement in C programming is an if statement that is another if-else statement inside it. And Inside else statement also another if-else statement present. Yes, both C and C++ allow us to nested if-else statements within if statements if-else, that is, we can place an if-else statement inside another else statement.

A program to check whether a number is positive, negative or zero. If positive to check whether the number is odd or even, demonstrate the use of nested if-else.

#include<stdio.h>//header file for standard input and output
int main()//main function initialised as integer
{//main function braces opened
	int num;//variable number initialised as integer to take user input
	printf("Enter the number you want to check");//print message
	scanf("%d",&num);//user input
	if(num>0)//test case to check if number is greater than 0
	{//if braces opened
		printf("\nThe number is positive");//positive message 
		if(num%2==0)//test case to check even or odd
			printf("\nThe number is even");//print message
		else//else case (if not satisfied)
			printf("\nThe number is odd");//print message
	}//if braces closed
	else if(num==0)//else if case where number is equal to zero
	{//braces opened
		printf("\nThe number is equals to zero");//print message 
	}//braces closed 
	else//else case if above cases not satisfied
	{//braces opened 
		printf("\nThe number is negative");//print message
	}//braces closed 
	return 0;//execution success
}//main function braces closed