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Calculating the Area of a Rectangle in C

The following C program demonstrates how to implement a function to calculate the area of a rectangle. This program takes the length and width of the rectangle as input from the user and then uses a custom function to calculate the area.

Program Code


// Function to calculate the area of a rectangle
float calculateArea(float length, float width) {
    return length * width;
}

int main() {
    float length, width, area;

    // Prompt the user to enter the length and width of the rectangle
    printf("Enter the length of the rectangle: ");
    scanf("%f", &length);
    printf("Enter the width of the rectangle: ");
    scanf("%f", &width);

    // Calculate the area of the rectangle using the custom function
    area = calculateArea(length, width);

    // Display the calculated area
    printf("The area of the rectangle is: %.2f\n", area);

    return 0;
}

How the Program Works

This C program consists of two main components: the `calculateArea` function and the `main` function.

The `calculateArea` Function

The `calculateArea` function takes two arguments, `length` and `width`, which represent the dimensions of the rectangle. It returns the calculated area by multiplying the length and width.

The `main` Function

The `main` function is the entry point of the program. It prompts the user to enter the length and width of the rectangle using `printf` and `scanf` statements. The entered values are stored in the `length` and `width` variables.

Next, the `main` function calls the `calculateArea` function, passing the `length` and `width` variables as arguments. The calculated area is stored in the `area` variable.

Finally, the `main` function displays the calculated area using a `printf` statement.

Example Output

Here's an example output of the program:


Enter the length of the rectangle: 5
Enter the width of the rectangle: 3
The area of the rectangle is: 15.00

FAQs

Q: What is the purpose of the `calculateArea` function?

A: The `calculateArea` function calculates the area of a rectangle given its length and width.

Q: How does the program handle invalid input?

A: The program does not include input validation. If the user enters invalid input, the program may produce incorrect results or crash.

Q: Can the program be modified to calculate the area of other shapes?

A: Yes, the program can be modified to calculate the area of other shapes by adding additional functions or modifying the existing `calculateArea` function.

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