Go Program to Calculate Area and Perimeter of Different Shapes

This page contains a Go program that calculates the area and perimeter of different shapes: circle, rectangle, and triangle.

Program Explanation

The Go program follows these steps:

1. Define the main package and import necessary packages: Use package main and import the fmt and math packages.
2. Define functions for each shape: Create separate functions to calculate the area and perimeter of a circle, rectangle, and triangle.
3. Main Function: The main function is the entry point of the program where the functions are called and results are printed.

Go Program Code

package main

import (
    "fmt"
    "math"
)

/**
 * Function to calculate the area and perimeter of a circle.
 * @param radius the radius of the circle
 * @return the area and perimeter of the circle
 */
func circleAreaPerimeter(radius float64) (float64, float64) {
    area := math.Pi * radius * radius
    perimeter := 2 * math.Pi * radius
    return area, perimeter
}

/**
 * Function to calculate the area and perimeter of a rectangle.
 * @param length the length of the rectangle
 * @param width the width of the rectangle
 * @return the area and perimeter of the rectangle
 */
func rectangleAreaPerimeter(length, width float64) (float64, float64) {
    area := length * width
    perimeter := 2 * (length + width)
    return area, perimeter
}

/**
 * Function to calculate the area and perimeter of a triangle.
 * @param a the length of the first side
 * @param b the length of the second side
 * @param c the length of the third side
 * @return the area and perimeter of the triangle
 */
func triangleAreaPerimeter(a, b, c float64) (float64, float64) {
    perimeter := a + b + c
    s := perimeter / 2 // semi-perimeter
    area := math.Sqrt(s * (s - a) * (s - b) * (s - c)) // Heron's formula
    return area, perimeter
}

/**
 * Main function which is the entry point of the program.
 */
func main() {
    // Calculate and print area and perimeter for a circle
    radius := 5.0
    circleArea, circlePerimeter := circleAreaPerimeter(radius)
    fmt.Printf("Circle: Radius = %.2f, Area = %.2f, Perimeter = %.2f\n", radius, circleArea, circlePerimeter)

    // Calculate and print area and perimeter for a rectangle
    length := 10.0
    width := 5.0
    rectangleArea, rectanglePerimeter := rectangleAreaPerimeter(length, width)
    fmt.Printf("Rectangle: Length = %.2f, Width = %.2f, Area = %.2f, Perimeter = %.2f\n", length, width, rectangleArea, rectanglePerimeter)

    // Calculate and print area and perimeter for a triangle
    a, b, c := 3.0, 4.0, 5.0
    triangleArea, trianglePerimeter := triangleAreaPerimeter(a, b, c)
    fmt.Printf("Triangle: Sides = %.2f, %.2f, %.2f, Area = %.2f, Perimeter = %.2f\n", a, b, c, triangleArea, trianglePerimeter)
}

Program Details

The program contains the following:

• circleAreaPerimeter Function: Calculates and returns the area and perimeter of a circle given its radius.
• rectangleAreaPerimeter Function: Calculates and returns the area and perimeter of a rectangle given its length and width.
• triangleAreaPerimeter Function: Calculates and returns the area and perimeter of a triangle given the lengths of its sides using Heron’s formula.
• main Function: The entry point of the program where the functions are called with sample values and the results are printed.

Running the Program

To run the program:

1. Save the code in a file named main.go.
2. Open a terminal and navigate to the directory where the file is saved.
3. Run the program using the command: go run main.go.

Explanation of the Go Program:

1. Package and Imports: The program starts with the main package declaration and imports the necessary fmt and math packages.
2. Functions for Each Shape:
   • circleAreaPerimeter: Calculates the area and perimeter of a circle given its radius.
   • rectangleAreaPerimeter: Calculates the area and perimeter of a rectangle given its length and width.
   • triangleAreaPerimeter: Calculates the area and perimeter of a triangle given the lengths of its sides using Heron’s formula.
3. main Function:
   • Defines sample values for a circle, rectangle, and triangle.
   • Calls the respective functions to calculate the area and perimeter.
   • Prints the results to the console using fmt.Printf.