Literal Constants

int-literal

Int constants must be in the range of -2,147,483,648 to 2,147,483,647 for 32 bit compilers.

Int constants must be in the range of -32,768 to 32,767 for 16 bit compilers.

character-literal

With a 16 bit compiler, a character literal can contain only 1 or 2 characters (or escape sequences.);

With a 32 bit compiler, a character literal can contain only 1 to 4 characters (or escape sequences.);

character-literal

The value of a character literal is the code points of the characters..

hexadecimal-digit

1. The values of the hexadecimal digits 0 through 9 are their usual decimal values.  The values of A through F are:

   UC	LC	Value
   A	a	10
   B	b	11
   C	c	12
   D	d	13
   E	e	14
   F	f	15

   (The digits A through F are not case sensitive.)

#include <stdio.h>
#include <limits.h> 

int main () {
  int i;           
  int j;           
  int k;       
  int m;       
  
  i = 1;          /* Decimal     */
  j = 020;        /* Octal       */
  k = 0X30;       /* Hexadecimal */
  m = 'A';        /* Character   */
  
  printf ("i (decimal %d) is %d\n", i, i);
  printf ("j (octal %o) is %d\n", j, j);
  printf ("k (hexadecimal %x) is %d\n", k, k);
  printf ("m (character %c) is %d\n", m, m);
  printf ("The size of the int type is %d bytes\n", sizeof(int));
  printf ("The size of the literal 1 is %d bytes\n", sizeof i);
  printf ("The size of the literal 020 is %d bytes\n", sizeof 020);
  printf ("The size of the literal 0X30 is %d bytes\n", sizeof 0X30);
  printf ("The size of the literal \'A\' is %d bytes\n", sizeof 'A');
  printf ("The range of the int type is from %d to %d\n",
          INT_MIN, INT_MAX);
  return 0;
}

i (decimal 1) is 1
j (octal 20) is 16
k (hexadecimal 30) is 48
m (character A) is 65
The size of the int type is 4 bytes
The size of the literal 1 is 4 bytes
The size of the literal 020 is 4 bytes
The size of the literal 0X30 is 4 bytes
The size of the literal 'A' is 4 bytes
The range of the int type is from -2147483648 to 2147483647