/*
 * We are gonna learn how to use define with sharps(#).
 *
 * There are two examples below. First, We are gonna study the single sharp in define
 * TEST(x) is mapped to printf(#x "=%d\n", x). #x is expressed as letter.
 * so, the result of this function is x = 0~. as you know, serializing strings such
 * as "123" "456" is joined as one string "123456".
 *
 * Second, double sharps is the meaning of concaternating strings.
 * JOIN(x) is defined with printf("lim%d\n", (int)1##x). if I just put x 2,
 * inteager 2 casted the letter "2". and it becomes (int)12.
 * So, the result of this function is "lim12"
 */



#include <stdio.h>

#define TEST(x) printf(#x "=%d\n", x)
#define JOIN(x) printf("lim%d\n", (int)1##x)


int main(int argc, char** argv)
{
    int i = 0;
    for (i = 0; i < 5; i++) {
        TEST(i);
    }
    JOIN(2);    // <-- print "12"
    return 0;
}