String Methods Part 1

Part of the Fundamentals section of Coddy's C# journey — lesson 61 of 69.

C# has a rich set of built-in string methods that allow you to perform various operations on strings. These methods provide functionalities for manipulating, searching, and transforming strings. Here are some commonly used string methods:

Length: Returns the number of characters in the string.
Substring(int startIndex): Returns a substring starting from the specified index to the end of the string.
Substring(int startIndex, int length): Returns a substring of specified length starting from the specified index.

StartsWith(string value): Checks if the string starts with the specified prefix.
EndsWith(string value): Checks if the string ends with the specified suffix.
ToUpper(): Converts the string to uppercase.

ToLower(): Converts the string to lowercase.
IndexOf(string value): Returns the index of the first occurrence of the specified substring. Returns -1 if the substring is not found.

Here's an example that demonstrates some of these methods:

string message = "Hello, World!";
int length = message.Length;
string sub = message.Substring(7);
string sub2 = message.Substring(0, 5);
int index = message.IndexOf("World");
bool starts = message.StartsWith("Hello");
string lower = message.ToLower();

Console.WriteLine("Length: " + length);
Console.WriteLine("Substring: " + sub);
Console.WriteLine("Substring 2: " + sub2);
Console.WriteLine("Index of 'World': " + index);
Console.WriteLine("Starts with 'Hello': " + starts);
Console.WriteLine("Lowercase: " + lower);

Challenge

Easy

Create a method named AnalyzeString that takes a string as input and prints the following analysis using string methods:

The length of the string
The substring starting from index 7 to the end
The substring from index 0 up to, but not including, index 5
Whether the string starts with "Hello"
The string converted to lowercase

The output should follow this exact format:

Length: [The length]
Substring: [The First substring]
Substring 2: [The Second substring]
Starts with 'Hello': [true or false]
Lowercase: [The string in lowercase]

Note: Assume the input string will be long enough for all operations.

Cheat sheet

C# provides built-in string methods for manipulating and analyzing strings:

Length: Returns the number of characters in the string
Substring(int startIndex): Returns a substring from the specified index to the end
Substring(int startIndex, int length): Returns a substring of specified length from the specified index
StartsWith(string value): Checks if the string starts with the specified prefix
EndsWith(string value): Checks if the string ends with the specified suffix
ToUpper(): Converts the string to uppercase
ToLower(): Converts the string to lowercase
IndexOf(string value): Returns the index of the first occurrence of the specified substring

string message = "Hello, World!";
int length = message.Length;                    // 13
string sub = message.Substring(7);              // "World!"
string sub2 = message.Substring(0, 5);          // "Hello"
int index = message.IndexOf("World");           // 7
bool starts = message.StartsWith("Hello");      // true
string lower = message.ToLower();               // "hello, world!"

Try it yourself

using System;

public class Program {
    public static void AnalyzeString(string str) {
        // Write your code here
    }

    public static void Main(string[] args) {
        string message = Console.ReadLine();
        AnalyzeString(message);
    }
}