数据类型

尽管我们已经谈到了sizeof运算符，我们将再简要的完整性。sizeof操作符返回字节大小，，的类型或变量。

你可以编译并运行下面的程序来找出你有多大的数据类型：

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#include <iostream>   int main() {     using namespace std;     cout << "bool:\t\t" << sizeof(bool) << " bytes" << endl;     cout << "char:\t\t" << sizeof(char) << " bytes" << endl;     cout << "wchar_t:\t" << sizeof(wchar_t) << " bytes" << endl;     cout << "short:\t\t" << sizeof(short) << " bytes" << endl;     cout << "int:\t\t" << sizeof(int) << " bytes" << endl;     cout << "long:\t\t" << sizeof(long) << " bytes" << endl;     cout << "float:\t\t" << sizeof(float) << " bytes" << endl;     cout << "double:\t\t" << sizeof(double) << " bytes" << endl;     cout << "long double:\t" << sizeof(long double) << " bytes" << endl;     return 0; }

bool:           1 bytes
char:           1 bytes
wchar_t:        2 bytes
short:          2 bytes
int:            4 bytes
long:           4 bytes
float:          4 bytes
double:         8 bytes
long double:    8 bytes

算术运算符（如？：）也被称为有条件的经营者，这是C++的只有三元运算符（需要3个操作数）。的？：操作者提供了一个速记的方法做一个特定类型的if/else语句。

如果别的以下表格报表：

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if (x > y)     z = x; else     z = y;