C宏定义中的 #，##，#@

#include <iostream>
#include <fstream>
#include <string>
#include <stdio.h>
using namespace std;

#define H1 123

#define SB(x) #x	//translate to a string
#define BB(x) U##x  //produce a new symbol
#define CB(x) #@x	//make the last to a char

void main()
{
	int x = H1;
	//cout<<x<<endl;
	ofstream fout("1.txt");
	fout<<x<<endl;
	fout<<"1234"<<endl;


	fout.close();
	FILE* fp = fopen("2.txt","w");
	fwrite(&x,4,1,fp);
	fprintf(fp,"%d",x);
	fclose(fp);
	string str = SB(123);
	std::cout<<str<<endl;
	int BB(1);
	U1 = 100;
	cout<<U1<<endl;
	char b = CB(14c2);
}

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C宏定义中的 #，##，#@

原文：http://blog.csdn.net/ddupd/article/details/38590187