C Programming

Question 1

/…../

Answer 1

Single-line comment in C programming

Question 2

/*
……
*/

Answer 2

Multi-line comment in C programming

Question 3

/*
* ……
* …..
*/

Answer 3

Multi-line comment in C programming

Question 4

The main() Function

Answer 4

The main() function is the starting point of the program.

Question 5

Include Files

Answer 5

include <stdio.h> Inserts the contents of a file (in this case, a file named stdio.h) into the current file. The purpose of these files</stdio.h>

(known as include files or header files) is to tell the compiler about the existence of external functions which the source code will make use of.

Question 6

Whitespace

Answer 6

The C language generally ignores whitespace (i.e., spaces, blank lines, tabs, etc.)

Question 7

The Preprocessor

Answer 7

When a line in a C program begins with the octothorpe character ‘#’, it indicates that this line is a
preprocessor directive. The preprocessor is actually a program that runs before the C compiler
itself. It serves to perform text substitutions on the source code prior to the actual compilation.

Question 8

The #define Directive

Answer 8

The simplest form of preprocessor directive is the #define statement. The #define statement initiates substitution. And #define directive can also perform rudimentary macro substitutions.

Question 9

define HALFOF(x) x/2

What is HALFOF(x)?

void main(void) {
printf(“Half of 10 is %d\n”, HALFOF(10));
}

Answer 9

HALFOF(x) = 10

void main(void) {
printf(“Half of 10 is %d\n”, 10/2);
}