several useful macros

several useful macros:

//macro.cpp
#include <iostream>
#include <string.h>
using namespace std;

#define DEBUG(x) cout << #x " = " << x << "/n"
#define TRACE(s) cerr << #s "/n", s
#define FIELD(a) char* a##_string; int a##_size

void print(char c)
{
    cout << c << "/n";
}

int main()
{
    FIELD(one);
    one_string = "Hello";
    one_size = strlen(aone_string);
    DEBUG(aone_string);
    for(int i = 0; i < aone_size; i++)
        TRACE(print(aone_string[i]))
    return 0;
}