Arithmetic operators - Mini Project: Build & Apply

Arithmetic Operators in C

📖 Scenario: You are helping a small shop calculate the total cost of items bought by a customer. Each item has a price, and the customer buys a certain quantity of each item.

🎯 Goal: Build a simple C program that calculates the total cost for each item using arithmetic operators and then sums all the costs to find the grand total.

📋 What You'll Learn

Create variables for item prices and quantities

Use arithmetic operators to calculate total cost per item

Sum all item totals to get the grand total

Print the grand total

💡 Why This Matters

🌍 Real World

Calculating costs and totals is common in shopping, billing, and budgeting applications.

💼 Career

Understanding arithmetic operators and printing output is essential for any programming job involving calculations.

1

Create variables for item prices and quantities

Create four variables in C: price1 with value 10, quantity1 with value 2, price2 with value 15, and quantity2 with value 3.

C

#include 

int main() {
    // Create variables price1, quantity1, price2, quantity2 with given values
    // Your code here

    return 0;
}

Need a hint?

Use int to declare integer variables and assign the exact values given.

2

Create variables for total cost per item

Create two variables in C: total1 and total2. Use the multiplication operator * to calculate total1 as price1 * quantity1 and total2 as price2 * quantity2.

C

#include 

int main() {
    int price1 = 10;
    int quantity1 = 2;
    int price2 = 15;
    int quantity2 = 3;

    // Calculate total1 and total2 using multiplication
    // Your code here

    return 0;
}

Need a hint?

Use the * operator to multiply price and quantity for each item.

3

Calculate the grand total

Create a variable grand_total and use the addition operator + to sum total1 and total2.

C

#include 

int main() {
    int price1 = 10;
    int quantity1 = 2;
    int price2 = 15;
    int quantity2 = 3;

    int total1 = price1 * quantity1;
    int total2 = price2 * quantity2;

    // Calculate grand_total by adding total1 and total2
    // Your code here

    return 0;
}

Need a hint?

Use the + operator to add the two totals.

4

Print the grand total

Use printf to display the text "Grand total: " followed by the value of grand_total and a newline.

C

#include 

int main() {
    int price1 = 10;
    int quantity1 = 2;
    int price2 = 15;
    int quantity2 = 3;

    int total1 = price1 * quantity1;
    int total2 = price2 * quantity2;

    int grand_total = total1 + total2;

    // Print the grand total
    // Your code here

    return 0;
}

Need a hint?

Use printf("Grand total: %d\n", grand_total); to print the result.