Question

4 tunction calculator 1. fett function calculator (num op num) ? The coding language should be written in scheme and please include the source code, execution, documentation.

In the coding language scheme, please including a comment what the program is doing and random output of n for executions.

Answer 1

//A c++ program to depict the calculator functioning using any four 
//operators and two operands given by the user.
# include <iostream>
//provides basic input and output services for C++ programs. 
//iostream uses the objects cin , cout , cerr , and clog for sending data to and from 
//the standard streams input, output, error (unbuffered), and log (buffered) respectively
using namespace std;

float calculate(float num1, char op, float num2) //function defintion to calculate operands according to the chosen operator
{
    float answer;

    switch (op) {

        case '+':
            answer = num1 + num2;
            break;

        case '-':
            answer = num1 - num2;
            break;

        case '/':
            answer = num1 / num2;
            break;

        case '*':
            answer = num1 * num2;
            break;

        default:
            return(0);
    }

    cout <<"\t\tAnswer = "; return answer;
}

int main()
//the execution of program starts from the main function.
//int is describing the return type of the main function.
 {
    float num1;
    float num2;
    char op;
   
   cout << "Enter operator for following four operators:->" <<endl;
   cout<<"Addition-> +"<<endl;
   cout<<"Subtraction-> -"<<endl; 
   cout<<"Multiplication-> *"<<endl;
   cout<<"Division-> / "<<endl;
   cout<<"Your chosen operator:";//input for the operand
   cin >> op;

  cout << "Enter two operand: First operand: ";
  cin >> num1;//input for first number
  cout << "\t\tSecond operand: ";
  cin >> num2;//input for second number
  
    cout << calculate(num1, op, num2) << endl;//function call
return 0;
}