What are header files and what are its uses in C programming?

C Programming Language > Overview of C Language > Basic Structure of C Programming

Short Question

7888

Answer:

Header files are also known as library files. They contain two essential things: the definitions and prototypes of functions being used in a program. Simply put, commands that you use in C programming are actually functions that are defined from within each header files. Each header file contains a set of functions. For example: stdio.h is a header file that contains definition and prototypes of commands like printf and scanf.

Go to Question List

This Particular section is dedicated to Question & Answer only. If you want learn more about C Programming Language. Then you can visit below links to get more depth on this subject.

C Syllabus

C Tutorial

C Chapterwise Programs

C Chapterwise MCQs

C Chapterwise Q & A

C Free Videos

# C Tutorials # JAVA Tutorials # HTML Tutorials # Computer Fundamental # Data Structure # DBMS Tutorials SQL # C# Language # R Language # PHP # Python # Vue JS

Join Our telegram group to ask Questions

Click below button to join our groups.

Ask Question - CSE

Programming Language - PDF

Related Program List

431. What is syntax error?

Answer: Syntax errors are associated with mistakes in the use of a programming language. It maybe a command that was misspelled or a command that must was entered in lowercase mode but was instead entered with an upper case character. A misplaced symbol, or lack of symbol, somewhere within a line of code can also lead to syntax error.

# Tutorial: Basic Structure of C Programming

Question: Overview of C Language Short

432. What are variables and it what way is it different from constants?

Answer: Variables and constants may at first look similar in a sense that both are identifiers made up of one character or more characters (letters, numbers and a few allowable symbols). Both will also hold a particular value. Values held by a variable can be altered throughout the program, and can be used in most operations and computations. Constants are given values at one time only, placed at the beginning of a program. This value is not altered in the program. For example, you can assigned a constant named PI and give it a value 3.1415 . You can then use it as PI in the program, instead of having to write 3.1415 each time you need it.

# Tutorial: Constants in C

Question: Constant in C Language Short

433. How do you access the values within an array?

Answer: Arrays contain a number of elements, depending on the size you gave it during variable declaration. Each element is assigned a number from 0 to number of elements-1. To assign or retrieve the value of a particular element, refer to the element number. For example: if you have a declaration that says "intscores[5];", then you have 5 accessible elements, namely: scores[0], scores[1], scores[2], scores[3] and scores[4].

# Tutorial: Single Dimensional Array

Question: Array in C Language Short

434. Can I use "int" data type to store the value 32768? Why?

Answer: No. "int" data type is capable of storing values from -32768 to 32767. To store 32768, you can use "long int" instead. You can also use "unsigned int", assuming you don

# Tutorial: int Data Type in C

Question: Data Types in C Language Short

435. Can two or more operators such as and be combined in a single line of program code?

Answer: Yes, it

# Tutorial: Basic Structure of C Programming

Question: Overview of C Language Short

436. Why is it that not all header files are declared in every C program?

Answer: The choice of declaring a header file at the top of each C program would depend on what commands/functions you will be using in that program. Since each header file contains different function definitions and prototype, you would be using only those header files that would contain the functions you will need. Declaring all header files in every program would only increase the overall file size and load of the program, and is not considered a good programming style.

# Tutorial: Basic Structure of C Programming

Question: Overview of C Language Short

437. When is the "void" keyword used in a function?

Answer: When declaring functions, you will decide whether that function would be returning a value or not. If that function will not return a value, such as when the purpose of a function is to display some outputs on the screen, then "void" is to be placed at the leftmost part of the function header. When a return value is expected after the function execution, the data type of the return value is placed instead of "void".

# Tutorial: Keywords in C

Question: Overview of C Language Short

438. What are compound statements?

Answer: Compound statements are made up of two or more program statements that are executed together. This usually occurs while handling conditions wherein a series of statements are executed when a TRUE or FALSE is evaluated. Compound statements can also be executed within a loop. Curly brackets { } are placed before and after compound statements.

# Tutorial: Basic Structure of C Programming

Question: Overview of C Language Short

439. What is the significance of an algorithm to C programming?

Answer: Before a program can be written, an algorithm has to be created first. An algorithm provides a step by step procedure on how a solution can be derived. It also acts as a blueprint on how a program will start and end, including what process and computations are involved.

# Tutorial: About C tutorial

Question: Fundamentals of C Language Short

440. What is the advantage of an array over individual variables?

Answer: When storing multiple related data, it is a good idea to use arrays. This is because arrays are named using only 1 word followed by an element number. For example: to store the 10 test results of 1 student, one can use 10 different variable names (grade1, grade2, grade3

# Tutorial: Single Dimensional Array

Question: Array in C Language Short

Chapterwise Java Program
Chapterwise C Program
Chapterwise Data Structure Program