putenv.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 str;
	str = "CPP=tarena";
	int r = putenv((char*)str.c_str());
	if(r<0) cout << "error!" << endl;
	else cout << "success!" << endl;
	char* p = getenv("CPP");
	if(p==NULL) cout << "no CPP!" << endl;
	else cout << p << endl;
}