Compute Central

Syntax:


#include:-Its type of preprocessor directive that is used of include header file in a program.
there is no space between # and include.
It is written as first statement in source code.
Syn:-
#include<header file>
eg:-#include<math.h>
#include<stdio.h>
#include"stdio.h"
#include"math.h"

*Header file:-It is special type of file that contains predefined extension of header file is ".h"
There are some header file in C language.

No.	Name	Description
1	"stdio.h"	Input/Output Functions
2	"conio.h"	console input/output
3	"assert.h"	Diagnostics Functions
4	"ctype.h"	Character Handling Functions
5	"cocale.h"	Localization Functions
6	"math.h"	Mathematics Functions
7	"setjmp.h"	Nonlocal Jump Functions
8	"signal.h"	Signal Handling Functions
9	"stdarg.h"	Variable Argument List Functions
10	"stdlib.h"	General Utility Functions
11	"string.h"	String Functions
12	"time.h"	Date and Time Functions

main():-It is an entry point in which we write source code according to requirement the execution
of program is started with from main function. It is a user defined function.
i) main()
{
block statement;
}
ii) void main()
{
block statement;
}
iii) int main()
{
block statement;
return(0);
}
Note:-Void is a keywords that is used to specify non return type function.
ii)main function:-It is return default integer value.

clrscr():- It stands for clear screen. It is use to clear the previous output on the consol.
It is avilable  in "conio.h" header file.
syn:- clrscr();

getch():-This function is used to input single character at a time.
It is avilable  in "conio.h" header file.
syn:- getch()'

#How to write C program?
We open any compiler of c for writing c program there are many compilers like Turbo C, Borland DevC, Microsoft visual C.

#How to save c program?
It must be saved with ".c" extension.

#Working Process of c program.