Array size and bounds in C++ - Mini Project: Build & Apply

Array size and bounds

📖 Scenario: You are helping a small store keep track of the number of items sold each day in a week. You will use an array to store these numbers.

🎯 Goal: Create an array to hold daily sales for 7 days, set a limit for the array size, and print the sales for each day without going out of bounds.

📋 What You'll Learn

Create an integer array named dailySales with exactly 7 elements.

Create an integer variable named size and set it to 7.

Use a for loop with an index variable i to access each element of dailySales safely.

Print each day's sales using std::cout.

💡 Why This Matters

🌍 Real World

Arrays are used to store lists of data like daily sales, temperatures, or scores. Knowing the size helps avoid errors when reading or writing data.

💼 Career

Understanding array size and bounds is essential for safe programming in many jobs, including software development, data analysis, and embedded systems.

1

Create the array with sales data

Create an integer array called dailySales with these exact values: 5, 8, 6, 7, 9, 4, 3.

C++

// Create the array dailySales with 7 elements
// Your code here

Need a hint?

Use int dailySales[7] = {5, 8, 6, 7, 9, 4, 3}; to create the array.

2

Set the array size variable

Create an integer variable called size and set it to 7.

C++

int dailySales[7] = {5, 8, 6, 7, 9, 4, 3};
// Create the variable size and set it to 7
// Your code here

Need a hint?

Use int size = 7; to store the array size.

3

Loop through the array safely

Use a for loop with the index variable i from 0 to less than size to access each element of dailySales. Inside the loop, write a comment // Access dailySales[i].

C++

int dailySales[7] = {5, 8, 6, 7, 9, 4, 3};
int size = 7;
// Use a for loop with i from 0 to less than size
// Your code here

Need a hint?

Use for (int i = 0; i < size; i++) to loop safely through the array.

4

Print the sales for each day

Inside the for loop, print the text "Day " followed by i + 1, then ": ", and then the value of dailySales[i] using std::cout. After the loop, print a newline.

C++

int dailySales[7] = {5, 8, 6, 7, 9, 4, 3};
int size = 7;
for (int i = 0; i < size; i++) {
    // Print sales for day i+1
    // Your code here
}

Need a hint?

Use std::cout << "Day " << (i + 1) << ": " << dailySales[i] << std::endl; inside the loop.