Question

write a program to make a calculator in c++​

Answer 1

This program takes an arithmetic operator (+, -, *, /) and two operands from an user and performs the operation on those two operands depending upon the operator entered by user.

Example: Simple Calculator using switch statement

# include <iostream>

using namespace std;

int main()

{

char op;

float num1, num2;

cout << "Enter operator either + or - or * or /: ";

cin >> op;

cout << "Enter two operands: ";

cin >> num1 >> num2;

switch(op)

{

case '+':

cout << num1+num2;

break;

case '-':

cout << num1-num2;

break;

case '*':

cout << num1*num2;

break;

case '/':

cout << num1/num2;

break;

default:

// If the operator is other than +, -, * or /, error message is shown

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

break;

}

return 0;

}

Output

Enter operator either + or - or * or divide : -

Enter two operands:

3.4

8.4

3.4 - 8.4 = -5.0

This program takes an operator and two operands from user.

The operator is stored in variable op and two operands are stored in num1 and num2 respectively.

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