Type modifiers in C - Mini Project: Build & Apply

Understanding Type Modifiers in C

📖 Scenario: You are working on a simple program that stores and displays information about a product's quantity and price. You need to use type modifiers to make sure the variables use the right amount of memory and represent the values correctly.

🎯 Goal: Build a C program that declares variables using type modifiers unsigned and long, assigns values, and prints them correctly.

📋 What You'll Learn

Declare an unsigned int variable called quantity and assign it the value 150

Declare a long int variable called price and assign it the value 50000

Declare an unsigned long int variable called total_cost

Calculate total_cost as quantity multiplied by price

Print the values of quantity, price, and total_cost using printf

💡 Why This Matters

🌍 Real World

Type modifiers help programmers use memory efficiently and avoid errors when working with numbers that have different ranges, such as quantities that cannot be negative or very large prices.

💼 Career

Understanding type modifiers is important for writing safe and efficient C programs, especially in embedded systems, systems programming, and performance-critical applications.

1

Declare variables with type modifiers

Declare an unsigned int variable called quantity and assign it the value 150. Also declare a long int variable called price and assign it the value 50000.

C

#include 

int main() {

    // Declare unsigned int quantity = 150
    // Declare long int price = 50000

    return 0;
}

Need a hint?

Use unsigned int quantity = 150; and long int price = 50000; inside main().

2

Declare total_cost variable

Declare an unsigned long int variable called total_cost inside main() to store the total cost.

C

#include 

int main() {
    unsigned int quantity = 150;
    long int price = 50000;

    // Declare unsigned long int total_cost

    return 0;
}

Need a hint?

Use unsigned long int total_cost; to declare the variable.

3

Calculate total_cost

Calculate the total cost by multiplying quantity and price, and assign the result to total_cost.

C

#include 

int main() {
    unsigned int quantity = 150;
    long int price = 50000;
    unsigned long int total_cost;

    // Calculate total_cost = quantity * price

    return 0;
}

Need a hint?

Use total_cost = quantity * price; to calculate the total cost.

4

Print the values

Use printf to print the values of quantity, price, and total_cost in this exact format:
Quantity: 150
Price: 50000
Total cost: 7500000

C

#include 

int main() {
    unsigned int quantity = 150;
    long int price = 50000;
    unsigned long int total_cost;

    total_cost = quantity * price;

    // Print quantity, price, and total_cost

    return 0;
}

Need a hint?

Use printf("Quantity: %u\n", quantity);, printf("Price: %ld\n", price);, and printf("Total cost: %lu\n", total_cost);.