After writing any program first we know about what is program? And
What are the essential rules for writing a program in c?
Program-: The collection or group of instructions & informations is called a program.
These are the some important rules for the writing a program in c--
1. Never use capital letters.
2. Use ; in last of statement.
3. Use variable to define parameters
a, x, y, p, q.... ✔
ax, bx, xy...... ✔
x1, x2, x5...... ✔
3x, 6x, 2x......❌
4. Header file should be included.
Two header files must be included
First-
#include<stdio.h>
Stdio means standard input/output.
Where .h is the extension of header file.
The work of this header file is --
In this files Printf() ; and scanf(); are executed.
Second-
#include<conio.h>
Conio means console input/output.
The work of this header file is--
In this file getch() ; and clrscr(); are executed.
. The purpose of getch(); is to hold the output on the console.
. The purpose of clrscr(); is to clear all the trash data on the console.
5. If we take integer type value then we have to use
Int
0-9
%d
If we take float type value then we have to use
float
0.1,.57,.886
%f
If we take charecter type value then we have to use
Char
a-z
%s
6. Program will start from main().
7. After main(); start the program with curly braces {_}.
8.
Let's take an example of c program---
#include<stdio.h>
#include<conio.h>
main()
{
printf("my name is A.");
getch();
}
Output of this program is
my name is A.
Note-:#<include> is pre processor command. This statement tells the pre- processors to include the information contained in the file stdio.h before it is past for the compilation.
main() - main is a special function name. Every c program has main function somewhere in the program. This function will be executed first when the program is run.
&- is used for the address of the value where stored.
If you are writing a c program in turbo c software then
To compile your program press Alt+f9
To run the program press Ctrl+f9.
