C Programming Question.Could you provide the correct answers? **Code Explanation and Matching Exercise**This code snippet demonstrates how to calculate the average of a variable number of arguments in C using the `stdarg.h` library.**Code:**```cdouble average(int num, ...){ va_list valist; double sum = 0.0; int i; /* initialize valist for num number of arguments */ va_start(valist, num); /* access all the arguments assigned to valist */ for (i = 0; i < num; i++) { sum += va_arg(valist, int); } /* clean memory reserved for valist */ va_end(valist); return sum/num;}```**Explanation:**- **`double average(int num, ...)`**: A function `average` that takes a fixed integer `num` and a variable number of additional arguments.- **`va_list valist;`**: Declares a variable `valist` of type `va_list` to hold the information needed by `va_start`, `va_arg`, and `va_end`.- **`va_start(valist, num);`**: Initializes `valist` to retrieve the additional arguments provided.- **`va_arg(valist, int);`**: Retrieves each argument in the list `valist` as an `int`.- **`va_end(valist);`**: Cleans up the memory used by `valist`.**Matching Terms to their Purpose:**- **function parameter “int num”**: Represents the total number of variable arguments passed.- **function parameter “...”**: Variable argument list.- **va_arg**: Access each item in the argument list.- **va_list**: Variable to store the variable argument list received as “...”.- **va_start**: Initializes `va_list` for the number of arguments.- **va_end**: Cleans up the memory assigned to the `va_list` variable.

Let's see the answer:Below are the answers:function parameter "int num" - represent the total number variable argument passedfunction parameter "..." - variable to store the variable argument list received as "..."va_arg - access each item in argument list.va_list - variable argument list va_start - intializes va_list for the number of arguments va_end - clean up the memory assigned to va_list variable

Engineering

Computer Science

Given the source code below, match the terms to their purpose in variable arguements. double average(int num, ...) { } va_list valist; double sum = 0.0; int i; /* initialize valist for num number of arguments */ va_start(valist, num); /* access all the arguments assigned to valist */ for (i = 0; i < num; i++) { sum += va_arg(valist, int); } /* clean memory reserved for valist */ va_end(valist); return sum/num; function parameter "int num" function parameter "..." va_arg va_list va_start represent the total number vi v [Choose ] variable argument list initializes va_list for the number of arguments represent the total number variable arguments passed variable to store the variable argument list received as access each item in argument list clean up the memory assigned to va_list variable access each item in argument v initializes va_list for the numt v

Given the source code below, match the terms to their purpose in variable arguements. double average(int num, ...) { } va_list valist; double sum = 0.0; int i; /* initialize valist for num number of arguments / va_start(valist, num); / access all the arguments assigned to valist / for (i = 0; i < num; i++) { sum += va_arg(valist, int); } / clean memory reserved for valist */ va_end(valist); return sum/num; function parameter "int num" function parameter "..." va_arg va_list va_start represent the total number vi v [Choose ] variable argument list initializes va_list for the number of arguments represent the total number variable arguments passed variable to store the variable argument list received as access each item in argument list clean up the memory assigned to va_list variable access each item in argument v initializes va_list for the numt v

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Concept of Pointer Parameter

Pointers are the special variable that stores the variable address, instead of storing the variable value. Pointer is a powerful feature of a programming language. A pointer is mostly used to save memory space and improve execution time.

Question

C Programming Question. Could you provide the correct answers?

**Code Explanation and Matching Exercise**

This code snippet demonstrates how to calculate the average of a variable number of arguments in C using the `stdarg.h` library.

**Code:**

```c
double average(int num, ...)
{
va_list valist;
double sum = 0.0;
int i;

/* initialize valist for num number of arguments */
va_start(valist, num);

/* access all the arguments assigned to valist */
for (i = 0; i < num; i++) {
sum += va_arg(valist, int);
}

/* clean memory reserved for valist */
va_end(valist);

return sum/num;
}
```

**Explanation:**

- **`double average(int num, ...)`**: A function `average` that takes a fixed integer `num` and a variable number of additional arguments.
- **`va_list valist;`**: Declares a variable `valist` of type `va_list` to hold the information needed by `va_start`, `va_arg`, and `va_end`.
- **`va_start(valist, num);`**: Initializes `valist` to retrieve the additional arguments provided.
- **`va_arg(valist, int);`**: Retrieves each argument in the list `valist` as an `int`.
- **`va_end(valist);`**: Cleans up the memory used by `valist`.

**Matching Terms to their Purpose:**

- **function parameter “int num”**: Represents the total number of variable arguments passed.
- **function parameter “...”**: Variable argument list.
- **va_arg**: Access each item in the argument list.
- **va_list**: Variable to store the variable argument list received as “...”.
- **va_start**: Initializes `va_list` for the number of arguments.
- **va_end**: Cleans up the memory assigned to the `va_list` variable.

Process by which instructions are given to a computer, software program, or application using code.

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