write a simple c program that will add 2 numbers and display the result on linux

Certainly! Below is a simple C program that adds two numbers and displays the result. You can compile and run this program on a Linux system.

### `add_numbers.c`

```c
#include <stdio.h>

int main() {
    float num1, num2, sum;

    // Ask user for input
    printf("Enter first number: ");
    scanf("%f", &num1);
    
    printf("Enter second number: ");
    scanf("%f", &num2);
    
    // Calculate sum
    sum = num1 + num2;

    // Display the result
    printf("Sum: %.2f\n", sum);

    return 0;
}
```

### Steps to Compile and Run the Program

1. **Open a Terminal** on your Linux system.

2. **Create a new file** named `add_numbers.c` using a text editor, such as `nano` or `vim`.

   ```bash
   nano add_numbers.c
   ```

3. **Copy and paste the code** above into the file and save it. In `nano`, you can save the file by pressing `CTRL + O`, then `Enter`, and exit with `CTRL + X`.

4. **Compile the program** using `gcc` (GNU Compiler Collection).

   ```bash
   gcc add_numbers.c -o add_numbers
   ```

5. **Run the compiled program**.

   ```bash
   ./add_numbers
   ```

6. **Follow the prompts** to enter the numbers to be added.

### Example Output

```
Enter first number: 5
Enter second number: 10.5
Sum: 15.50
```

This program uses `float` to allow for decimal number input as well. You can change `float` to `int` if you only want to work with integer values.