int toascii (int c);

a macro thats convert c into ascii chars

#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */
 
#include <ctype.h> 
 
 void main(void) 
 { 
   int i; 
 
   for (i=0x2a; i<=0x42; i++) { 
     printf("%#04x is %c\n", i, toascii(i));
   } 
 
 }

  output
  user@host:~$ ./toascii 
  0x2a is *
  0x2b is +
  0x2c is ,
  0x2d is -
  0x2e is .
  0x2f is /
  0x30 is 0
  0x31 is 1
  0x32 is 2
  0x33 is 3
  and so on, and so on