Practice Exercises: Fundamentals

Let's think about this for a second

This exercise set is designed to help you revisit and practice the variables, operators, if/else, loops, and arrays concepts covered in the Basic chapter. There's no new teaching here — just a chance to actually write code using the syntax you've already learned. Treat each task as its own little project: create a new console app for it and run it. The tasks are simple, but writing and running the syntax hands-on will help it stick in your memory far better than just reading about it.

Exercises

(1) Print only the even numbers from 1 to 50 using a for loop. (2) Create an integer array (say, 6 elements) and use a foreach loop to find the sum and average of the numbers in the array. (3) Read a user-entered age with Console.ReadLine() and use if/else if/else to categorize it as "Child", "Teenager", or "Adult". (4) Read a string from the user and use a loop to count both the total number of characters and the number of vowels (a, e, i, o, u) in it.

Ran the even number loop task and got the correct output
Ran the array sum/average task and got the correct output
Finished both the age categorization task and the vowel count task

Code Example

csharp

// Task 1 starter
for (int i = 1; i <= 50; i++)
{
    if (i % 2 == 0)
    {
        Console.WriteLine(i);
    }
}

// Task 2 starter
int[] numbers = { 4, 8, 15, 16, 23, 42 };
int sum = 0;
foreach (int n in numbers)
{
    sum += n;
}
double average = (double)sum / numbers.Length;
Console.WriteLine($"Sum: {sum}, Average: {average}");

// Task 3 starter
Console.Write("Enter age: ");
int age = int.Parse(Console.ReadLine());
// if / else if / else ဖြင့် Child / Teenager / Adult ခွဲပါ

// Task 4 starter
Console.Write("Enter a sentence: ");
string text = Console.ReadLine();
int vowelCount = 0;
// loop သုံးပြီး vowel count ကို တွက်ပါ

You should see

All four tasks will print correct results to the console: the list of even numbers, the sum/average, the age category, and the vowel count.

5-Minute Challenge

Modify Task 2 so it also finds the largest and smallest numbers in the array — but without using Math.Max/Math.Min, using a loop instead (5 minutes).

A Quick Heads-Up

Remember that integer division (int / int) only returns an int result — don't forget to cast to (double) for calculations like averages or percentages.