C++基础 数据类型

#include 
#include 
using namespace std;

int main_day2() 
{
	short num1 = 10;		//-32768 ~ 32767
	int num2 = 100;			//
	long num3 = 1000;		//
	long long num4 = 10000;	//

	cout << num1 << endl;
	cout << num2 << endl;
	cout << num3 << endl;
	cout << num4 << endl;
	cout << "int占用的内存空间为: " << sizeof(int) << "字节" << endl;
	cout << "num3占用的内存空间为: " << sizeof(num3) << "字节" << endl;
	cout << "num4占用的内存空间为: " << sizeof(num4) << "字节" << endl;

	cout << "n" << endl;//换行

	float numble1 = 3.14f;
	double numble2 = 3.14159265358979;
	cout << numble1 << endl;
	cout << numble2 << endl;
	cout << "float占用的内存空间为: " << sizeof(float) << "字节" << endl;	//4字节
	cout << "double占用的内存空间为: " << sizeof(double) << "字节" << endl;	//8字节

	cout << "n" << endl;//换行

	char ch = 'a';
	cout << ch << endl;
	cout << "char占用的内存空间为: " << sizeof(char) << "字节" << endl;	//4字节

	cout << "n" << endl;//换行

	cout << "atHelloWorldn" ;
	cout << "aatHelloWorldn" ;
	cout << "aaatHelloWorldn";
	cout << "aaaatHelloWorldn";

	cout << "n" << endl;//换行

	char HelloWorld1[] = "HelloWorld";
	string HelloWorld2 = "HelloWorld";
	cout << HelloWorld1 << endl;
	cout << HelloWorld2 << endl;

	cout << "n" << endl;//换行

	bool flag = true;
	cout << flag << endl;
	flag = false;
	cout << flag << endl;
	cout << "bool占用的内存空间为: " << sizeof(bool) << "字节" << endl;	//1字节

	cout << "n" << endl;//换行

	int a = 0;
	cout << "请输入整型变量a的值：";
	cin >> a;
	cout << "a = " << a <<  endl;

	float b = 0.0f;
	cout << "请输入浮点型变量b的值：";
	cin >> b;
	cout << "b = " << b << endl;

	char c = 0;
	cout << "请输入字符型变量c的值：";
	cin >> c;
	cout << "c = " << c << endl;

	string s = "";
	cout << "请输入字符串型变量s的值：";
	cin >> s;
	cout << "s = " << s << endl;

	bool d = false;
	cout << "请输入布尔型变量d的值：";
	cin >> d;
	cout << "d = " << d << endl;

	cout << "n" << endl;//换行

	system("pause");
	return 0;
}