vc6.0简单使用

1.打开文件 新建项目(ctrl+N)

2.创建工作空间 工作项目 项目文件

#include <iostream>
using namespace std;
int main()
{
    cout << "Hello, world!" << endl;
    return 0;
}

#include <iostream>
using namespace std;
void func(int a=11,int b=22,int c=33)
{
	cout <<"a="<<a<<",b="<<b<<",c="<<c<<endl;
}
int main()
{
	func();
    func(5);
	func(77,99);
	func(8,88,888);
	return 0;


}

#include <iostream>
using namespace std;
int main()
{
	int oneInt=1;
	int & ref=oneInt;
	int const &refc=oneInt;// refc类型是可变的 不可以通过oneInt不改改变 
	//const int &refc=oneInt;//refc类型是不变的 可以通过oneInt改变
	ref=2;
	cout <<"oneInt="<<oneInt<<",ref="<<ref<<endl;
	cout <<"refc="<<refc<<endl;
	oneInt=3;
	cout<<"ref="<<ref<<endl;
	cout<<"refc="<<refc<<endl;
	int &ref2=ref;
	cout <<"ref2="<<ref2<<endl;
	return 0;

}

#include <iostream>
#include <string>
using namespace std;
int main()
{
	string str;
	if(str.empty())
		cout << "str is null."<<"lenghth="<<str.length()<<endl;
		else
		cout <<"str is not null."<<endl;
	str=str.append("abcdefg");
	cout << "str is "<<str<<",size="<<str.size()<<endl;
	const char *p=str.c_str();//临时指针
			cout<<"p="<<p<<endl;
		cout<<"find:"<<str.find("de",0)<<endl;//3
		cout<<"find:"<<str.find("de",4)<<endl;//查找失败 很大的数
		string str1=str.insert(4,"123");
		cout<<str1<<endl;
		return 0;
}