C++ sizeof operator

عناصر التسلسل في C++

sizeof It is a keyword, which is a compile-time operator used to determine the byte size of a variable or data type.

The sizeof operator can be used to get the size of class, structure, union, and other user-defined data types.

The syntax of sizeof is as follows:

sizeof(data type)

In this example, data type is the data type to be calculated for size, including class, structure, union, and other user-defined data types.

Please try the following example to understand the usage of sizeof in C++. Copy and paste the following C++ program into the test.cpp file, compile and run the program.

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

عندما يتم تجميع وكتابة الكود أعلاه وتنفيذه، سيتم إنتاج النتيجة التالية، والتي ستختلف اعتمادًا على الآلة المستخدمة:

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

عناصر التسلسل في C++