Basic of c program part 1

CREATED 

C is a general-purpose, high-level language that was originally developed by Dennis M. 

Ritchie to develop the UNIX operating system at Bell Labs. C was originally first implemented on the DEC PDP-11 computer in 1972.

1. Easy to learn
2. Structured language

FIRST WE NEED NOW ABOUT DATA TYPE :

Data Type	Maximum Value	Minimum Value
int	2,147,483,647	- 2,147,483,648
float	3.4028235E38	1.4E-45
double	1.7976931348623157E308	4.9E-324
char	65,535	0
short	32767	-32768
long	9223372036854775807	-9223372036854775808

INT =Is used fot number. 

eg: 

        int a;

        a=10;

like that we are using.

      

SAME AS ALL THE DATA TYPE :

FLOT= Is used for decimal point value assign 

CHAR= Is used for character assign

printf= Is used for print the output  ex: first program if you change inside the ("") with your name it will dispaly the output in your name   printf("jmsoftware\n");

# is a preprocessor directive 

stdio.h=standard input and output header file it a meaning for this line .

we see the example program :

Example 1 - C hello world program
/** My first C program */

#include <stdio.h>

int main()
{
  printf("Hello World\n");
  return 0;
}

Output of program:
"Hello World"

Example 2 - C program to get input from a user using scanf

#include <stdio.h>

int main() // the compiler start to compile at int main
{
  int x;

  printf("Input an integer\n");
  scanf("%d", &x); // %d is used for an integer

  printf("The integer is: %d\n", x);

  return 0;
}

Output:
Input an integer
7897
The integer is: 7897