Question

Use Dec-C++ compiler

Problem 13, Chapter 8 Programming Exercises 8.3 8.3. Write a program CHECKBOOK that prompts the user for an amount and either + or -. If the user enters +, then balance, an extern variable, is incremented by the amount. If the user enters -, then balance is decremented by the amount. Two functions, deposit and withdraw, perform the updating operations.

Answer 1

I have written the program using CPP PROGRAMMING LANGUAGE .

TASK : to write the deposit and withdraw functions in order to update the balance extern variable .

INPUT :

extern int balance = 1000;

OUTPUT :

For deposit :

null

For Withdraw :

Please find the snippet of code below ..

CODE :

#include <iostream> //included iostream module

using namespace std;

extern int balance = 1000; //initialized and declared variable balance

// function definition for deposit

void deposit(int amount){

balance += amount;//increamented balance by amount

}

//function definition for withdraw

void withdraw(int amount){

balance -= amount; //decremented balance by amount

}

//main method

int main() {

int amount; // declared variable amount

char operators;//declared variable operators

cout << "Enter an amount:\t"; //to print the message on console

cin >> amount;//to take the input from user

//used while loop for getting the proper input from user until user enters a valid value

while(true){

cout << "Please enter + or -\n+ is for deposit \n- is for withdraw:\t";

cin >> operators;

if(operators == '+'){

deposit(amount); // calling deposit function

break; //to break the while loop

}else if(operators == '-'){

withdraw(amount); //calling withdraw function

break; //to break the while loop

}else{

cout << "Please enter either + or -\n";

continue; //to continue the while loop

}

}

//finally printing the remaining balance on console.

cout << "\nYour Remaining balance is "<<balance;

}

Thanks ..