C#: Check if a string starts with a specified word

Last update on June 23 2025 12:59:35 (UTC/GMT +8 hours)

Check String Starts with Word

Write a C# program to check if a string starts with a specified word.
Note: Suppose the sentence starts with "Hello"
Sample Data: string1 = "Hello how are you?"
Result: Hello.

C# Sharp Exercises: Check if a string starts with a specified word

Sample Solution:-

C# Sharp Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

public class Exercise34 {
    static void Main(string[] args) {
        // Declare a string variable 'str' to store user input
        string str;

        // Display a message asking the user to input a string
        Console.Write("Input a string : ");

        // Read user input and store it in the 'str' variable
        str = Console.ReadLine();

        // Check conditions and output result based on string content
        // Check if the length of the string is less than 6 and it's equal to "Hello"
        // OR check if the string starts with "Hello" and the character at index 5 is a space (' ')
        Console.WriteLine((str.Length < 6 && str.Equals("Hello")) || (str.StartsWith("Hello") && str[5] == ' '));
    }
}

Sample Output:

Input a string : Hello how are you?                                    
True

Flowchart:

For more Practice: Solve these Related Problems:

Write a C# program to check if a given string starts with a user-defined substring, case-insensitively.
Write a C# program to validate if a sentence starts with a specific word and ends with a punctuation mark.
Write a C# program to find how many times a string starts with a given word in a list of sentences.
Write a C# program to check if a sentence starts with a certain word and contains another keyword later on.

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