Nested if in Cpp programming language

We will learn about Nested if in Cpp programming language

In the C++ programming language, use of if statements inside another if block or another else block is called nested if statements.

Declaration

Syntax

The syntax of nested if in C++ language

if(Test_expression){ //outer if
statement(s)
//when the test expression is true
//executes this statements

        if(Test_expression){ //inner if
          statement(s)
        //when the test expression is true
      //executes this statements
}
}

Flow diagram of Nested if statements

Example

Program 1

#include <iostream>

using namespace std;

int main()
{
    int age=25;
    int marks=56;
    if(age>=18){
    cout << "Age is enough" << endl;
    if (marks>=50){
        cout << "marks is enough" << endl;
        cout << "you can get the job" << endl;
    }

    }
    return 0;
}

When we executed above program, it will be produced following result

age is enough
marks is enough
you can get the job

Flow diagram of nested if-else in C++

In the nested-if statements of C++ language, initially flow of control enters the outer loop and boolean expression is evaluated.

When the test expression is true, the body of if statements are executed. Then, the flow of control enters inner if for evaluation of the boolean expression.

If the test expression is false, it executes the codes inside the body of else and exits from the body of if.

The syntax of nested if – else statements

if(Test_expression1){ //outer if 
statement(s) 
//when the test expression is true 
//executes this statements         
       if(Test_expression2){ //inner if           
         statement(s)         
//when the test expression2 is true       
//executes this statements
         }
       else{
           statement(s) 
           //when the test expression2 is true 
            //executes this statements    
       }
else{
statement(s) 
//when the test expression1 is true 
//executes this statements    
}

Program 2

#include <iostream>

using namespace std;

int main()
{
    int iqMarks=70;
    double zScore=0.9;
    if(iqMarks>=60){
        cout << "Your marks is better" << endl;
          if(zScore>=0.8){
        cout << "Your Zsore is enough" << endl;
        cout << "You can enter university" << endl;
          }

        else{
            cout << "your Zscore is not enough" << endl;
        }

}
else{
            cout << "your marks is not better" << endl;
        }
    cout << "End the program" << endl;
    return 0;
}

When we execute above program, it will be produced the following result

Your marks is better
Your Z score is enough
Your can enter university
End the program

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