Question

I need Calculator project :

A complex number calculator program that allows the user to do either addition, subtraction, multiplication or

division where a complex number is a number of the form a + bi where a and b are real numbers and i equals √

−1.

1. It must consist of at least five functions excluding the main function.

2. There should be a function for each operation. Each of these functions should handle checking the validity of its operands

that must be parameters of the function, perform their given operation and simplify their result. They must not perform

any form of I/O. However, the functions can have additional parameters; but, you will be responsible for deciding the

return types of these functions, which do not have to be the same.

3. There must be a calculator function that takes no parameters that is responsible for displaying a menu of the operations to

the user, receiving the choice of the user, calling the appropriate function to perform the chosen operation, and displaying

the result of the operation in the format

a + b i or a - b i

where a and b are displayed with one decimal point and the second display is for when b is negative, or an error message.

Furthermore, if the user selects an invalid option display the message ''Invalid Operation''.

a.The program should only perform at most one operation per run.

b. The main function should only call the calculator function.

c. The program cannot use loops.

d. The program can only include the libraries iostream, string, and iomanip.

Answer 1

Please refer to screenshots

Code

Output

Code to copy

#include <iostream>
#include <string>
#include <iomanip>

using namespace std;

// structure to hold complex number
struct complexnumber{
    double real;
    double imaginary;
};

complexnumber add(complexnumber a, complexnumber b){
    complexnumber z;
    z.real = a.real + b.real; // calculating real part
    z.imaginary = a.imaginary + b.imaginary; // calculating imaginary part
  
    return z;
}

complexnumber subtract(complexnumber a, complexnumber b){
    complexnumber z;
    z.real = a.real - b.real; // calculating real part
    z.imaginary = a.imaginary - b.imaginary; // calculating imaginary part
  
    return z;
}

complexnumber multiply(complexnumber a, complexnumber b){
    complexnumber z;
  
    // calculating real part
    z.real = (a.real * b.real) - (a.imaginary * b.imaginary);
  
    // calculating imaginary part
    z.imaginary = (a.real + a.imaginary) * (b.real + b.imaginary);
    z.imaginary = z.imaginary - ((a.real * b.real) + (a.imaginary * b.imaginary));
  
    return z;
}

complexnumber divide(complexnumber a, complexnumber b){
    // denominator of result, common for real and imaginary part
    double den = (b.real * b.real) + (b.imaginary * b.imaginary);
  
    complexnumber z;
  
    // calculating real part
    z.real = (a.real * b.real) + (a.imaginary * b.imaginary);
    z.real = z.real / den;
  
    // calculating imaginary part
    z.imaginary = (a.imaginary * b.real) - (a.real * b.imaginary);
    z.imaginary = z.imaginary / den;
  
    return z;
}

void calculator(){
    cout<<"Welcome to complex number calculator\n\n";
  
    cout<<"1 for Addition\n";
    cout<<"2 for Subtration\n";
    cout<<"3 for Multiplication\n";
    cout<<"4 for Division\n";
  
    complexnumber a, b;
  
    // Input first number
    cout<<"Enter First Complex Number\n";
    cout<<"Enter Real Part: ";
    cin>>a.real;
    cout<<"Enter Imaginary Part: ";
    cin>>a.imaginary;
  
    // Input second number
    cout<<"Enter Second Complex Number\n";
    cout<<"Enter Real Part: ";
    cin>>b.real;
    cout<<"Enter Imaginary Part: ";
    cin>>b.imaginary;
  
    cout<<"\nChoose your operation\n";
  
    int ch;
    cin>>ch; // input choice
  
    complexnumber z;
  
    switch(ch){
        // if user choose addition
        case 1: z = add(a, b);
                break;
              
                // if user choose subtract
        case 2: z = subtract(a, b);
                break;
              
                // if user choose multiply
        case 3: z = multiply(a, b);
                break;
              
                // if user choose division
        case 4: z = divide(a, b);
                break;
              
                // If user choose invalid option
        default: cout<<"Invalid Operation\n";
                return;
    }
  
    cout<<"Result of operation is\n";
    cout<< fixed << setprecision(1); // setting precision to one decimal point
    cout<<z.real;
  
    if(z.imaginary < 0){
        z.imaginary *= -1; // if imaginary part is negative
        cout<<" - ";
    } else {
        cout<<" + "; // if imaginary part is positive
    }
  
    cout<<z.imaginary<<'\n'; // printing imaginary part
}

int main(){
    calculator();
  
    return 0;
}

Thank you