Array bounds checking behavior in C Sharp (C#) - Mini Project: Build & Apply

Array bounds checking behavior

📖 Scenario: Imagine you have a list of daily temperatures for a week. You want to safely access these temperatures without causing errors if you try to look beyond the list.

🎯 Goal: You will create an array of temperatures, set a limit for valid indexes, try to access elements safely, and see what happens when you go out of bounds.

📋 What You'll Learn

Create an integer array called temperatures with exactly these values: 20, 22, 19, 24, 21, 23, 20

Create an integer variable called maxIndex and set it to the last valid index of the temperatures array

Use a for loop with variable i from 0 to maxIndex to print each temperature

Add a line to try to print the temperature at index maxIndex + 1 and observe the behavior

💡 Why This Matters

🌍 Real World

Arrays are used everywhere to store lists of data like temperatures, scores, or names. Knowing how to safely access them prevents program crashes.

💼 Career

Understanding array bounds checking is important for writing reliable software and avoiding common runtime errors in many programming jobs.

1

Create the temperatures array

Create an integer array called temperatures with these exact values: 20, 22, 19, 24, 21, 23, 20

C Sharp (C#)

# Your code here

Need a hint?

Use int[] temperatures = { ... }; to create the array with the exact numbers.

2

Set the maximum valid index

Create an integer variable called maxIndex and set it to the last valid index of the temperatures array

C Sharp (C#)

int[] temperatures = {20, 22, 19, 24, 21, 23, 20};
# Your code here

Need a hint?

Use temperatures.Length - 1 to get the last valid index.

3

Print all temperatures using a for loop

Use a for loop with variable i from 0 to maxIndex to print each temperature from the temperatures array

C Sharp (C#)

int[] temperatures = {20, 22, 19, 24, 21, 23, 20};
int maxIndex = temperatures.Length - 1;
# Your code here

Need a hint?

Use a for loop from 0 to maxIndex and print temperatures[i].

4

Try to access an out-of-bounds index

Add a line to print the temperature at index maxIndex + 1 from the temperatures array and observe the output

C Sharp (C#)

int[] temperatures = {20, 22, 19, 24, 21, 23, 20};
int maxIndex = temperatures.Length - 1;
for (int i = 0; i <= maxIndex; i++)
{
    System.Console.WriteLine(temperatures[i]);
}
# Your code here

Need a hint?

When you run this code, you will see the temperatures printed, then an error because maxIndex + 1 is outside the array.