C Language Updates

C is an procedure oriented programming language. For any begginer the word program is new.

Program: Set of instructions to be followed by machine or computer.

Instruction Examples: Arithmetic instruction like 

a=b+c;

 Semi colon here indicates end of instruction.

Collecting different variety of instructions into one name and executing it on machine. That one common name is noting but a procedure, function or method.

A C program can have n number of methods.

First sample program:

#include <stdio.h>
int main()
{
   // printf() displays the string inside quotation
   printf("Hello, World!");//printf is a predefined library function
   return 0;
}

First Line of program includes the header file <stdio.h>. #include <stdio.h> is a preprocessor command. This command tells compiler to include the contents of stdio.h (standard input and output) file in the program.
Header files in C contaions predefined function definitions. Example: printf(); 

main(): Function that starts the execution of program.

int: here it is return type of main()
A function can return any type of value.Here main is returning int so last line of program 
contains return statment having default int value 0. 

 After compiling  this program we get the filename.obj file. Linker performs linking and at the end we get filename.exe. This exe file is an executable file which is finally executed.

It is a general purpose high level language used to make software for operating systems (kernel programms), game development, Embedded devices etc. It avoids the complexity of writing machine code and provides a easy understanding to the developer. Also, this is considered as base for developing many other high level programming language.

/* WAP to print square value of the number entered by user using odd loop*/

//Header Files

#include<stdio.h>
#include<conio.h>

//Main Function

void main()
{
 char another='y';
 int num,sq;

// Function for clearing the screen

 clrscr();

// Odd Loop

 while(another=='y')
 {
  printf("Enter a number:");
  scanf("%d",&num);

  sq=num*num;
  printf("Square of %d is %d",num,sq);
  printf("\nWant to enter another number y/n:");
  scanf("%c",&another);
  another=getchar();
 }

//Function for holding the screen on console
 getch();
}