nested if else statement in c++


  • It is perfectly all right if we write an entire if...else construct within either the body of the if statement or the body of an else statement. This is called ‘nesting’of ifs.
  • Nested if...else statements has ability to control program flow based on multiple levels of condition.

Syntax

    if(condition)
    {
       // Statements inside body of if
    }
    else if(condition)
    {
       //Statements inside body of else if
    }
    else
    {
        //Statements inside body of else
    }

Flow Diagram

    nested-if-else statement in c++ language

Example

    // adifelse.cpp
    // demonstrates IF...ELSE with adventure program
    #include using namespace std;
    #include<conio.h>              //for getche()
    
    int main()
     {
      char dir=’a’;
       int x=10, y=10;
    
       cout << “Type Enter to quit ”;
       while( dir != ‘ ’ ) //until Enter is typed
       {
        cout << “ Your location is “ << x << “, “ << y;
        cout << “ Press direction key (n, s, e, w): “;
    
        dir = getche(); //get character
         if( dir==’n’) //go north
           y--;
       else
        if( dir==’s’ ) //go south
            y++;
        else
         if( dir==’e’ ) //go east
           x++;
         else if( dir==’w’ ) //go west
          x--;
      } //end while
    return 0;
    } //end main
    

Output

    Your location is 10, 10
    Press direction key (n, s, e, w): n
    Your location is 10, 9
    Press direction key (n, s, e, w): e
    Your location is 11, 9
    Press direction key (n, s, e, w):