getenv2.cc

达内IT培训Unix C++第一天源码 是入门Unix 下C++编程的好东西

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

int main()
{
	string name;
	for(;;){
		cout << "input environment name:";
		cin >> name;
		if(name=="quit") break;
		char* p=getenv(name.c_str());
		if(p==NULL)
			cout << "not found!" << endl;
		else
			cout << p << endl;
	}
}