Question

Simple calculator program. The program should ask the user for a number, an operator, and then a second number. The operator should be either '+', '-', 'x', or '/'. The program should then report the answer to the problem. Use a switch statement, not an if statement. Note that "operator" is a reserved word in C++, so you cannot use it as a variable name. Use double variables and setprecision(2).

Answer 1

#include <iostream>
#include <iomanip> // std::setprecision

using namespace std;

int main()
{
// Declaring variables
double num1, num2;
char operatr, ch;
  
//Setting the number to two decimal places
std::cout << std::setprecision(2) << std::fixed;

// Getting the first number from the user
cout << "Enter a first number:";
cin >> num1;
while (true)
{

// getting the operator
cout << "Enter Operator :";
cin >> operatr;

// Based on operator corresponding case will get executed
switch (operatr)
{
case '+':
{
// Getting the Second number
cout << "Enter a Second Number :";
cin >> num2;

// Displaying the result
cout << num1 << " + " << num2 << " is :" << (num1 + num2) << endl;
break;
}
case '-':
{
// Getting the Second number
cout << "Enter a Second Number :";
cin >> num2;
cout << num1 << " - " << num2 << " is :" << (num1 - num2) << endl;
break;
}
case '*':
{
// Getting the Second number
cout << "Enter a Second Number :";
cin >> num2;
// Displaying the result
cout << num1 << " * " << num2 << " is :" << (num1 * num2) << endl;
break;
}
case '/':
{

do
{
// Getting the Second number
cout << "Enter a Second Number :";
cin >> num2;
if (num2 == 0)
{
cout << "** Invalid.Should'nt be Zero **" << endl;
}

} while (num2 == 0);
// Displaying the result
cout << num1 << " / " << num2 << " is :" << (num1 / num2) << endl;
break;
}
default:
{
cout << "** Invalid Operator **" << endl;
continue;
}
}
cout << "\nDo you Want to continue(Y/N):";
cin >> ch;

if (ch == 'y' || ch == 'Y')
{
cout << "Enter a first number:";
cin >> num1;
continue;
}
else
break;
}

return 0;
}

_______________________

Output:

CAProgram Files (x86) Dev-CppMinGW64 bin\OperatorAndTwoNumbers.exe nter Operator :$ nter OperatoF + Enter a first number:45 *Invalid Operator ** 45 65 is :110 Do you Want to continueY/N>:Y nter a Second Number :65 nter a first number:78 nter OperatoF nter a Second Number :3 78 / 3 is :26 Do you Want to continue Y/N>EN Process exited after 30.05 seconds with return value 0 Press any key to continue . - .

________________Thank You