#include<iostream>

#include<string>

using namespace std;

void main()

{

string password,answer;

float x,y;

float sum,difference,product,quotient;

char Operation;

cout<<"enter password:"<<endl;

cin>>password;

if (password=="rhino")

{

cout<<"enter Letter Operation"<<endl;

cout<<"a for Addition"<<endl;

cout<<"s for Subtraction"<<endl;

cout<<"m for Multiplication"<<endl;

cout<<"d for Division"<<endl;

cin>>Operation;

while(answer!="no")//(answer=="yes");

{

switch(Operation)

{

case 'a':

cout<<"enter first number"<<endl;

cin>>x;

cout<<"enter second number"<<endl;

cin>>y;

sum=x+y;

cout<<"The sum is:"<<sum<<endl;

cout<<"do you want to continue?"<<endl;

cout<<"Yes or No:"<<endl;

cin>>answer;

if (answer=="yes"){

cout<<"enter Letter Operation"<<endl;

cout<<"a for Addition"<<endl;

cout<<"s for Subtraction"<<endl;

cout<<"m for Multiplication"<<endl;

cout<<"d for Division"<<endl;

cin>>Operation;}

break;

case 's':

cout<<"enter first number"<<endl;

cin>>x;

cout<<"enter second number"<<endl;

cin>>y;

difference=x-y;

cout<<"The difference is:"<<difference<<endl;

cout<<"do you want to continue?"<<endl;

cout<<"Yes or No:"<<endl;

cin>>answer;

if(answer=="yes"){

cout<<"enter Letter Operation"<<endl;

cout<<"a for Addition"<<endl;

cout<<"s for Subtraction"<<endl;

cout<<"m for Multiplication"<<endl;

cout<<"d for Division"<<endl;

cin>>Operation;}

break;

case 'm':

cout<<"enter first number"<<endl;

cin>>x;

cout<<"enter second number"<<endl;

cin>>y;

product=x*y;

cout<<"The product is:"<<product<<endl;

cout<<"do you want to continue?"<<endl;

cout<<"Yes or No:"<<endl;

cin>>answer;

if(answer=="yes"){

cout<<"enter Letter Operation"<<endl;

cout<<"a for Addition"<<endl;

cout<<"s for Subtraction"<<endl;

cout<<"m for Multiplication"<<endl;

cout<<"d for Division"<<endl;

cin>>Operation;}

break;

case 'd':

cout<<"enter first number"<<endl;

cin>>x;

cout<<"enter second number"<<endl;

cin>>y;

quotient=x/y;

cout<<"The quotient is:"<<quotient<<endl;

cout<<"do you want to continue?"<<endl;

cout<<"Yes or No:"<<endl;

cin>>answer;

if(answer=="yes"){

cout<<"enter Letter Operation"<<endl;

cout<<"a for Addition"<<endl;

cout<<"s for Subtraction"<<endl;

cout<<"m for Multiplication"<<endl;

cout<<"d for Division"<<endl;

cin>>Operation;}

break;

default:

cout<<"Letter Incorrect"<<endl;

break;

}

}

}else

cout<<"SoRRy WrOng PaSSwOrd!!!TrY AgaIn...";

}