Count the Number of Vowels in a Given String

This program counts the number of vowels (a, e, i, o, u) in a given string using the Go programming language. Below is the complete code with an explanation of its structure.

Go Program

// Package main defines the entry point for the program
package main

// Importing the fmt package for formatted I/O
import (
    "fmt"
    "strings"
)

// Function countVowels takes a string input and returns the count of vowels in it
func countVowels(s string) int {
    // Variable to hold the count of vowels
    count := 0

    // Convert the string to lowercase to make the function case-insensitive
    s = strings.ToLower(s)

    // Loop through each character in the string
    for _, char := range s {
        // Check if the character is a vowel
        if char == 'a' || char == 'e' || char == 'i' || char == 'o' || char == 'u' {
            // Increment the count if a vowel is found
            count++
        }
    }

    // Return the total count of vowels
    return count
}

// Main function is the entry point of the program
func main() {
    // Example string to count vowels
    str := "Hello, World!"

    // Call countVowels function and store the result
    result := countVowels(str)

    // Print the result
    fmt.Printf("The number of vowels in '%s' is: %d\n", str, result)
}
    

Explanation

• Package main: Defines the entry point of the Go program.
• Import fmt and strings: Imports necessary packages for formatted I/O and string manipulation.
• Function countVowels: Takes a string as input, converts it to lowercase, and iterates through each character to count the vowels.
• Variable count: Stores the number of vowels found in the string.
• strings.ToLower(s): Converts the input string to lowercase to make vowel counting case-insensitive.
• for _, char := range s: Iterates through each character in the string.
• If condition: Checks if the character is a vowel and increments the count if true.
• Return count: Returns the total count of vowels found in the string.
• Function main: The entry point of the program that calls countVowels with an example string and prints the result.

Usage

To run the program, save the code in a file with a .go extension and execute it using the Go compiler:

$ go run filename.go

The program will output the number of vowels in the given string.