Simple Calculator Program in Go

This Go program implements a basic calculator with operations for addition, subtraction, multiplication, and division.

Go Code:

/*
A simple calculator program in Go.
*/

package main

import (
    "fmt"
)

// Function to add two numbers
func add(num1, num2 float64) float64 {
    return num1 + num2
}

// Function to subtract two numbers
func subtract(num1, num2 float64) float64 {
    return num1 - num2
}

// Function to multiply two numbers
func multiply(num1, num2 float64) float64 {
    return num1 * num2
}

// Function to divide two numbers
func divide(num1, num2 float64) (float64, error) {
    if num2 == 0 {
        return 0, fmt.Errorf("Cannot divide by zero")
    }
    return num1 / num2, nil
}

func main() {
    // Example usage
    num1 := 10.5
    num2 := 5.2
    
    // Perform operations
    sum := add(num1, num2)
    difference := subtract(num1, num2)
    product := multiply(num1, num2)
    quotient, err := divide(num1, num2)
    
    // Check for divide by zero error
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    
    // Output results
    fmt.Println("Sum:", sum)
    fmt.Println("Difference:", difference)
    fmt.Println("Product:", product)
    fmt.Println("Quotient:", quotient)
}
  

Explanation:

The Go code above defines a simple calculator program with the following components:

• Function Definitions: Functions (add, subtract, multiply, divide) are defined to perform basic arithmetic operations.
• Function Documentation: Each function includes comments to describe their purpose, parameters, return values, and potential errors.
• Error Handling: The divide function returns an error if the divisor is zero, using fmt.Errorf to create a descriptive error message.
• Example Usage: Variables num1 and num2 are initialized with example values, and the functions are called to perform addition, subtraction, multiplication, and division operations.
• Output: The results of each operation (sum, difference, product, quotient) are printed to the console using fmt.Println.

Usage:

To use this calculator program:

1. Edit the values of num1 and num2 to input different numbers.
2. Run the Go program to perform addition, subtraction, multiplication, and division operations based on the input values.

Explanation:

1. Function Definitions:
   • Functions (add, subtract, multiply, divide) are explained with their roles in performing arithmetic operations in Go.
2. Function Documentation:
   • Each function includes comments to describe their purpose, parameters, return values, and potential errors that may occur.
3. Error Handling:
   • The divide function returns an error if the divisor (num2) is zero, demonstrating error handling in Go using fmt.Errorf.
4. Example Usage:
   • Variables num1 and num2 are initialized with example values, and the functions (add, subtract, multiply, divide) are called to perform operations.
5. Output:
   • The results of each operation (sum, difference, product, quotient) are printed to the console using fmt.Println.
6. Usage Instructions:
   • Instructions are provided on how to use the calculator program by editing the input variables, running the Go program, and observing the results of arithmetic calculations.