C ++ Nested If Else Statement

Another important decision-making statement of C++ language is nested if-else, in which an if-else statement is nested inside an if statement, hence this program control structure is named nested if-else.

Working of nested if-else

If the condition of outer if statement is false then the statement connected to its else part(optionally declared) is executed and nested if-else is not executed.

The statement connected to the if of the nested if-else is only executed when -:

The condition of its outer if statement is true and,
The condition of this nested if statement is also true.

If condition of this nested if is false then the statement with its connected else is executed.

A nested if-else example

/* nested if-else example */


#include<iostream>

using namespace std;
int main()
{

if(9<10)
{
	if(9<8)
	 	cout<<"9 is less than 10 & 99 is also less than 8";
	else
		cout<<"9 is less than 10 but 9 is not less than 8";
}
else 
	cout<<"9 is not less than 10";
	
return 0;
}

Output

9 is less than 10 but 9 is not less than 8

Another nested if-else example

//* nested if-else example */


#include<iostream>

using namespace std;
int main()
{

if('a'<'b')
{
	if(9>8)
	 	cout<<"a is less than b and 9 is greater than 8";
	else
		cout<<"a is less than b and 9 is less than 8";
}
else 
	cout<<"a is not less than b";
	
return 0;
}

Output

a is less than b and 9 is greater than 8

In the latter program, we have compared values in char variables, internally their ASCII values have been compared to find out which character has a greater ASCII value.