#include <stdio.h>
  
  int main()
  {
  	int luckyNumber = 5;
  	float radius = 2;
  	char myName[15] = "John";
  	char initial = 'J';
  	
  	printf( "Hellow World!\n" ); /* the format string contains only o
 							 ordinary characters. Ordinary characters 
 							 are output unmodified.
 							 A character string in C is of type
 							 "char *".*/
  	
  	printf( "My lucky number is %d\n", luckyNumber ); /*The "%d" specifies
 							 that an integer value will be output.*/
  	
  	printf( "My name is %s\n", myName ); /* The %s specifies that a character
 							 string will be output.*/
  	
  	printf( "My first initial is %c\n", initial ); /*The %c specifies that a
 							 character will be output.*/
 							 
  	printf( "The area of a circle with radius %f is %f\n", radius, 3.14* radius*radius );
 								 //%f specifies that a float will be output
  	
  	printf( "Hello %s or should I say %c\n", myName, initial );
 							 //multiple arguments of different types may be output.
  	
  	getchar();
  	return(0);
  }