C++ Nested If Statement

In C++, the nested-if is another decision-making statement in which an if statement is nested inside an outer if statement, hence it is named nested if.

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

condition of outer if statement is true, and
condition of the nested if statement is also true.

Note: There could be an optional else statement associated with the outer if statement, which is only executed when the condition of the outer if statement is evaluated to be false and in this case, the condition of nested if condition won't be checked at all.

nested if example

/* C++ nested if statement*/

#include<iostream>

using namespace std;
int main()
{
if(99<100)
{
	if(99>98)  // This is a nested if  statement
	cout<<"99 is less than 100 & 99 is greater than 98";
}

else 
	cout<<"99 is not less than 100";
	
return 0;
}

Output

99 is less than 100 & 99 is greater than 98

Another nested if example

/* C++ nested if statement*/

#include

using namespace std;
int main()
{
if('c'>'a')
{
	// A nested if  statement
	if('c'>'b')  
	cout<<"c is greater than b and c is greater than a";
}

else 
	cout<<"b is not less than a";
	
return 0;
}

Output

c is greater than b and c is greater than a

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