Why operators are needed in C - See It in Action

Why operators are needed

📖 Scenario: Imagine you want to calculate the total cost of apples and oranges you bought. You have the number of apples and oranges and their prices. To find the total cost, you need to add the costs of apples and oranges. This is where operators help us do math easily in programming.

🎯 Goal: You will create variables for the number of apples and oranges, their prices, and use operators to calculate the total cost. Finally, you will print the total cost.

📋 What You'll Learn

Create integer variables for the number of apples and oranges

Create float variables for the price of apples and oranges

Use the multiplication operator to find the cost of apples and oranges

Use the addition operator to find the total cost

Print the total cost using printf

💡 Why This Matters

🌍 Real World

Calculating total prices is common in shopping apps, billing systems, and budgeting tools.

💼 Career

Understanding operators is essential for any programming job that involves calculations or data processing.

1

Create variables for quantities and prices

Create an integer variable called num_apples and set it to 3. Create an integer variable called num_oranges and set it to 5. Create a float variable called price_apple and set it to 0.50. Create a float variable called price_orange and set it to 0.75.

C

# Create variables for number and price of apples and oranges
# Your code here

Need a hint?

Use int for whole numbers and float for decimal numbers. Remember to add f after decimal numbers for floats.

2

Calculate cost of apples and oranges

Create a float variable called cost_apples and set it to num_apples * price_apple. Create a float variable called cost_oranges and set it to num_oranges * price_orange.

C

int num_apples = 3;
int num_oranges = 5;
float price_apple = 0.50f;
float price_orange = 0.75f;

# Calculate cost of apples and oranges
# Your code here

Need a hint?

Use the multiplication operator * to find the cost by multiplying quantity and price.

3

Calculate total cost

Create a float variable called total_cost and set it to cost_apples + cost_oranges.

C

int num_apples = 3;
int num_oranges = 5;
float price_apple = 0.50f;
float price_orange = 0.75f;

float cost_apples = num_apples * price_apple;
float cost_oranges = num_oranges * price_orange;

# Calculate total cost by adding cost_apples and cost_oranges
# Your code here

Need a hint?

Use the addition operator + to add the costs together.

4

Print the total cost

Use printf to print the text Total cost: $ followed by the value of total_cost with two decimal places.

C

int num_apples = 3;
int num_oranges = 5;
float price_apple = 0.50f;
float price_orange = 0.75f;

float cost_apples = num_apples * price_apple;
float cost_oranges = num_oranges * price_orange;

float total_cost = cost_apples + cost_oranges;

# Print the total cost with printf
# Your code here

Need a hint?

Use printf("Total cost: $%.2f\n", total_cost); to print the total cost with two decimal places.