- sizeof (type name);
- sizeof (expr);
- sizeof expr;
例如以下程式計算出各種整數型態宣告組合所佔的位元組數
#include <iostream> int main() { std::cout << "short : " << sizeof(short) << std::endl; std::cout << "short int : " << sizeof(short int) << std::endl; std::cout << "signed short : " << sizeof(signed short) << std::endl; std::cout << "signed short int : " << sizeof(signed short int) << std::endl; std::cout << "unsigned short : " << sizeof(unsigned short) << std::endl; std::cout << "unsigned short int : " << sizeof(unsigned short int) << std::endl; std::cout << "int : " << sizeof(int) << std::endl; std::cout << "signed : " << sizeof(signed) << std::endl; std::cout << "signed int : " << sizeof(signed int) << std::endl; std::cout << "unsigned : " << sizeof(unsigned) << std::endl; std::cout << "unsigned int : " << sizeof(unsigned int) << std::endl; std::cout << "long : " << sizeof(long) << std::endl; std::cout << "long int : " << sizeof(long int) << std::endl; std::cout << "signed long : " << sizeof(signed long) << std::endl; std::cout << "signed long int : " << sizeof(signed long int) << std::endl; std::cout << "unsigned long : " << sizeof(unsigned long) << std::endl; std::cout << "unsigned long int : " << sizeof(unsigned long int) << std::endl; return 0; } /* 《程式語言教學誌》的範例程式 http://pydoing.blogspot.com/ 檔名:sizeofint.cpp 功能:計算 int 所佔的位元組數 作者:張凱慶 時間:西元 2010 年 10 月 */
編譯後執行,結果如下
中英文術語對照 | |
---|---|
位元組數 | byte |
您可以繼續參考
運算式
型態轉換
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參考資料
C++ reference
cplusplus.com
Cprogramming.com C++ Tutorial
C++ Primer, Fourth Edition, Stanley B. Lippman...
本文於 2013 年 1 月更新
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