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nested if else statement in c++

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• 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

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):