C++ Programming: Complete Guide to Learn the Basics of C++ Programming in 7 Days by S Martin Xavier

Author:S Martin, Xavier [S Martin, Xavier]
Language: eng
Format: epub
Published: 2020-06-21T16:00:00+00:00

4.4 Menu Program, C++

Problem

Write a C++ program that reads operand and operator from the user and prints the answer.

Solution :

#include <iostream>

using namespace std;

int main()

{

char o;

float n, m;

cout << "Enter an operator (+, -, *, /): ";

cin >> o;

cout << "Enter first operand: ";

cin >> n;

cout << "Enter second operand: ";

cin >> m;

switch (o)

{

case '+':

cout << n << " + " << m << " = " << n+m;

break;

case '-':

cout << n << " - " << m << " = " << n-m;

break;

case '*':

cout << n << " * " << m << " = " << n*m;

break;

case '/':

cout << n << " / " << m << " = " << n/m ;

break;

default:

// operator is doesn't match any case constant (+, -, *, /)

cout << "Error! operator is not correct";

break;

}

return 0;}

Output :

When you will compile this code, a console screen will pop up saying

Enter an operator (+, -, *, /):

After entering operator, let’s say /, your program will ask for your operands, one by one, as

Enter first operand:

Enter second operand:

Let’s say you have entered both operands, 2. Your program will print output such as

2 / 2 = 1

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