Increment and decrement operators - Mini Project: Build & Apply

Increment and Decrement Operators in C

📖 Scenario: Imagine you are managing a small shop's inventory. You need to keep track of the number of items available. Sometimes you add new items, and sometimes items are sold. You will use increment and decrement operators to update the item count quickly.

🎯 Goal: You will create a simple C program that uses increment (++) and decrement (--) operators to update the number of items in stock and then display the final count.

📋 What You'll Learn

Create an integer variable called items with an initial value.

Create an integer variable called restock to hold the number of new items added.

Use the increment operator ++ to increase the items count.

Use the decrement operator -- to decrease the items count.

Print the final value of items.

💡 Why This Matters

🌍 Real World

Increment and decrement operators are used in many programs to update counters, track quantities, or manage loops efficiently.

💼 Career

Understanding these operators is essential for programming jobs that involve managing data, loops, or real-time updates, such as software development and embedded systems.

1

Create the initial item count

Create an integer variable called items and set it to 10 to represent the starting number of items in stock.

C

# Create an integer variable called items and set it to 10
// Your code here

Need a hint?

Use int items = 10; inside the main function.

2

Add new items to restock

Create an integer variable called restock and set it to 5 to represent new items added to the stock.

C

#include 

int main() {
    int items = 10;
    // Create an integer variable called restock and set it to 5
    // Your code here
    return 0;
}

Need a hint?

Use int restock = 5; inside the main function after items.

3

Update item count using increment and decrement operators

Use the increment operator ++ to increase items by restock times, and then use the decrement operator -- to decrease items by 3 to represent sold items. Use a for loop with variable i to increment items exactly restock times.

C

#include 

int main() {
    int items = 10;
    int restock = 5;
    // Use a for loop with i to increment items restock times
    // Then decrement items by 3
    // Your code here
    return 0;
}

Need a hint?

Use two for loops: one to increment items restock times, and one to decrement items 3 times.

4

Print the final item count

Use printf to display the final value of items with the message: "Final items in stock: %d\n".

C

#include 

int main() {
    int items = 10;
    int restock = 5;
    for (int i = 0; i < restock; i++) {
        items++;
    }
    for (int i = 0; i < 3; i++) {
        items--;
    }
    // Print the final items count
    // Your code here
    return 0;
}

Need a hint?

Use printf("Final items in stock: %d\n", items); to show the result.