Why methods are needed in C Sharp (C#) - Challenge Your Understanding

Challenge - 5 Problems

❓ Predict Output

intermediate

Understanding method reuse in C#

What will be the output of this C# program that uses a method to greet a user?

C Sharp (C#)

using System;
class Program {
    static void Greet(string name) {
        Console.WriteLine($"Hello, {name}!");
    }
    static void Main() {
        Greet("Alice");
        Greet("Bob");
    }
}

A Hello, Alice!\nHello, Bob!

B Hello, Alice!\nHello, Alice!

C Hello, Bob!\nHello, Bob!

D Compilation error due to missing return type

💡 Hint

Look at how the method Greet is called with different names.

The method Greet is called twice with different arguments, so it prints greetings for both Alice and Bob.

🧠 Conceptual

intermediate

Why use methods in programming?

Which of the following is the main reason to use methods in programming?

A To make the program run slower

B To repeat the same code multiple times without rewriting it

C To increase the size of the program unnecessarily

D To confuse other programmers

💡 Hint

Think about how methods help with code repetition.

Methods allow you to write code once and reuse it many times, making programs shorter and easier to manage.

❓ Predict Output

advanced

Effect of methods on program structure

What will be the output of this C# program that uses methods to calculate and print the area of a rectangle?

C Sharp (C#)

using System;
class Program {
    static int CalculateArea(int width, int height) {
        return width * height;
    }
    static void Main() {
        int area = CalculateArea(5, 3);
        Console.WriteLine(area);
    }
}

A Compilation error due to missing return statement

B 8

C 15

D 53

💡 Hint

Multiply width and height inside the method.

The method CalculateArea returns the product of width and height, which is 5 * 3 = 15.

🧠 Conceptual

advanced

How methods improve code maintenance

Which statement best explains how methods help maintain code?

A Methods allow fixing a bug in one place instead of many places

B Methods increase the chance of errors by duplicating code

C Methods make code harder to read and understand

D Methods prevent the program from running

💡 Hint

Think about how changing code in one method affects the whole program.

When code is inside a method, fixing it once updates all uses, making maintenance easier.

❓ Predict Output

expert

Understanding method parameters and output

What will be the output of this C# program that uses a method with parameters and prints results?

C Sharp (C#)

using System;
class Program {
    static void PrintSum(int a, int b) {
        Console.WriteLine(a + b);
    }
    static void Main() {
        int x = 4;
        int y = 7;
        PrintSum(x, y);
        PrintSum(y, x);
    }
}

A 47\n74

B Compilation error due to missing method return type

C 4\n7

D 11\n11

💡 Hint

The method adds two numbers and prints the result.

Both calls add 4 and 7, resulting in 11 printed twice.