Hello World C

Hello World C

How to write a hello world in C language? To learn a programming language, you must start writing programs in it, and this could be your first C program. Let's see. Basic Program of C language.

#include <stdio.h>             //Pre-processor directive
#include <conio.h>

void main()                    //main function declaration

{
 printf("Hello world\n");      //to output the string on a display

  getch();                     //terminating function

}

Output:-

C hello world using character variables

#include <stdio.h>

#include <conio.h>

void main()

{
  char a = 'H', b = 'e', c = 'l', d = 'o';
  char e = 'w', f = 'r', g = 'd';

  printf("%c%c%c%c%c %c%c%c%c%c", a, b, c, c, d, e, d, f, c, g);

  getch();
}

Output:-

We have used seven-character variables, '%c' is used to display a character variable. See other efficient ways below.

We  store "hello world" in a string (a character array).

#include <stdio.h>

#include <conio.h>

void main()

{
  char s1[] = "HELLO WORLD";
  char s2[] = {'H','e','l','l','o',' ','w','o','r','l','d','\0'};

  printf("%s %s", s1, s2);

  getch();
}

Output:

HELLO WORLD Hello world

If you Don't understand the program don't worry.

C Hello world a number of times

Using a loop we can display it a number of times.

#include <stdio.h>

#include <conio.h>

void main()
{
  int c, n;

  puts("How many times?");
  scanf("%d", &n);

  for (c = 1; c <= n; c++)
    puts("Hello world!");

  getch();
}

Output:-

Hello world in C indefinitely

#include <stdio.h>

#include <conio.h>

void main()
{
  while (1)  // This is always true, so the loop executes forever
    puts("Hello World");

  getch();
}

To terminate the program press (Ctrl + C)..