Nested if statement in C++

In nested if statement, one if statement block is enclosed within another if statement block.

The syntax of nested if statement is:

if(Test-Condition-1)
{
  if(Test-Condition-2)
    Statement-Block-1;
  else      
    Statement-Block-2;
}
else
{
  if(Test-Condition-3)
    Statement-Block-3;
  else      
    Statement-Block-4;
}

Test-Condition-1, Test-Condition-2 and Test-Condition-3 are relational or logical expressions that are checked to execute different set of statements. 

Initially Test-Condition-1 condition is evaluated. If it is true, Test-Condition-2  condition is evaluated. If Test-Condition-2 is also true, Statement-Block-1 of statements gets executed. If Test-Condition-2 condition is false, Statement-Block-2  of statements is executed. If Test-Condition-1  condition is false, Test-Condition-3 condition is evaluated. If it  is true, Statement-Block-3 of statements gets executed. if Test-Condition-3 is false, Statement-Block-4 of statements gets executed.

Example:

#include<iostream>
using namespace std;
int main()
{
  int n;
  cout<<“\nEnter a value=";
   cin>>n;
   if(n>=0)
   {
     if(n<=10)
       cout<<“Value lies between 0 and 10";
     else
       cout<<“Value is larger than 10";
   }
   else
        cout<<“Value is smaller than 0";
return(0);  
}

Example:

Enter a value:=11 
Value is larger than 10

In the above program, value of variable n has been entered 11. 

Test condition if(n>=0) is true, So condition if(n<=10) is also checked.

This  condition is false so statement cout<<“Value is larger than 10″; gets executed. 

Lesson tags: nested if else statement in C++, nested if in c, nested if statement in c, program of nested if statement in C++, syntax of nested if statement in C++

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