# 1. Introduction

Arithmetic is one of the pillars of programming. As we continue our journey into the basics of C programming, today's focus is on multiplication. Through a simple program that multiplies two numbers, we will explore fundamental coding practices such as variable usage, capturing user input, and displaying outputs.

# 2. Program Overview

Our program's structure involves:

1. Asking the user to provide two numbers.

2. Capturing and storing the numbers.

3. Multiplying the numbers.

4. Displaying the product.

# 3. Code Program

```
#include <stdio.h> // Incorporating the Standard I/O library to utilize input and output functions
int main() { // The main function, acting as the starting point of our program
double num1, num2, product; // Declare three variables of type double: two for the user's input and one for the multiplication result
// Prompt the user to enter their numbers
printf("Enter the first number: ");
scanf("%lf", &num1); // Capture and store the first number
printf("Enter the second number: ");
scanf("%lf", &num2); // Capture and store the second number
product = num1 * num2; // Calculate the product of the two numbers
printf("The product of %.2lf and %.2lf is: %.2lf\n", num1, num2, product); // Display the multiplication result
return 0; // Indicate the program has run successfully
}
```

### Output:

Enter the first number: 5 Enter the second number: 4 The product of 5.00 and 4.00 is: 20.00

# 4. Step By Step Explanation

1. *#include <stdio.h>*: This inclusion integrates the standard input/output library, enabling us to use foundational functions such as *printf* and *scanf*.

2. *int main()*: All C programs commence their execution from the *main* function.

3. *double num1, num2, product;*: Here, we set aside memory for three *double* type variables to hold our two numbers and the resulting product.

4. The *printf* function: Utilized to display messages or prompts to the user.

5. The *scanf* function: This function captures user input. With *%lf*, we specify that we're dealing with the *double* datatype. The ampersand (*&*) signifies the memory address, indicating where in memory the input value should be saved.

6. *product = num1 * num2;*: This line carries out the multiplication operation.

7. *return 0;*: This line is a convention, indicating that the program executed without errors.

Through this basic multiplication program, newcomers to C programming are introduced to user interactions, arithmetic operations, and the structure of a simple program.

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