3.c++ 数据的输入 - cin

语法：

• cin >> 变量；

#include <iostream>
#include <string>

using namespace std;

int main()
{
	//整型
	int a = 0;
	cout << "请给整型变量a赋值:" << endl;
	cin >> a;
	cout << "整型变量a=" << a << endl;

	//浮点型
	int f = 3.14f;
	cout << "请给浮点型变量f赋值:" << endl;
	cin >> a;
	cout << "浮点型变量f=" << f << endl;

	//字符型
	char ch = 'a';
	cout << "请给字符型变量ch赋值：" << endl;
	cin >> ch;
	cout << "字符型变量ch = " << ch << endl;

	//字符串
	string str = "hello";
	cout << "请给字符串str赋值：" << endl;
	cin >> str;
	cout << "字符串的str = " << str << endl;

	//布尔类型 只要是非0的值否代表真
	bool flag = false;
	cout << "请给布尔类型flag赋值：" << endl;
	cin >> flag;
	cout << "布尔类型flag = " << flag << endl;


	system("pause");

	return 0;

}