c program

Sure! Here is a response that gives explanations for each step of a C program:

#include <stdio.h>

int main() {
    int a, b, sum;

    printf("Enter two numbers: ");
    scanf("%d%d", &a, &b);

    sum = a + b;

    printf("The sum of %d and %d is %d\n", a, b, sum);

    return 0;
}

The line #include <stdio.h> is a preprocessor directive that tells the compiler to include the header file stdio.h. This header file provides functions for input and output operations, such as printf and scanf.
The int main() function is the entry point of the program. It is where the execution of the program begins. The int keyword specifies that the function returns an integer value. The main function has an empty parameter list, indicating that it does not accept any arguments.
The int a, b, sum; declares three integer variables a, b, and sum. These variables are used to store the user input and the sum of the two numbers.
The printf function is used to display a message to the user, asking them to enter two numbers. The message is specified within double quotes, and the %d format specifier is used to indicate the location where the values of a and b will be inserted.
The scanf function is used to read the user input. The %d format specifier is used to indicate that the input should be treated as an integer. The & operator is used to get the memory addresses of the variables a and b, so that the values entered by the user can be stored in those variables.
The line sum = a + b; calculates the sum of the two numbers entered by the user and assigns the result to the variable sum.
The second printf function is used to display the result to the user. The message specifies the values of a, b, and sum using the %d format specifier.
The return 0; statement indicates the end of the main function and the successful execution of the program. The value 0 is returned to the operating system, indicating that the program terminated without any errors.