Greedy的工作室

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C++与Java基本数据类型及所占用内存空间比较
----------------C++------------------------Java----------
(01)01)bool----------------1 byte-----01)boolean--1 byte
(02)02)char----------------1 byte-----02)char-----2 bytes
(03)---signed char---------1 byte     03)byte-----1 byte
(04)---unsigned char-------1 byte
(05)03)wchar_t-------------2 bytes
(06)04)short---------------2 bytes----04)short----2 bytes
(07)---unsigned short------2 bytes
(08)05)int-----------------4 bytes----05)int------4 bytes
(09)---unsigned int--------4 bytes
(10)06)long----------------4 bytes----06)long-----8 bytes
(11)---unsigned long-------4 bytes
(12)07)long long-----------8 bytes
(13)---unsigned long long--8 bytes
(14)08)float---------------4 bytes----07)float----4 bytes
(15)09)double--------------8 bytes----08)double---8 bytes
(16)10)long double--------12 bytes
----------------------------------------------------------
 
下面C++代码在Code::Blocks 8.02 中测试通过。
 
#include <iostream>
#include <iomanip>
using namespace std;
 
#define W setw(20)
 
int main(int argc,char** argv) {
    cout.setf(ios_base::right);
    cout<<W<<"bool:"<<sizeof(bool)<<endl;
    cout<<W<<"char:"<<sizeof(char)<<endl;
    cout<<W<<"signed char:"<<sizeof(signed char)<<endl;
    cout<<W<<"unsigned char:"<<sizeof(unsigned char)<<endl;
    cout<<W<<"wchar_t:"<<sizeof(wchar_t)<<endl;
    cout<<W<<"short:"<<sizeof(short)<<endl;
    cout<<W<<"unsigned short:"<<sizeof(unsigned short)<<endl;
    cout<<W<<"int:"<<sizeof(int)<<endl;
    cout<<W<<"unsigned int:"<<sizeof(unsigned int)<<endl;
    cout<<W<<"long:"<<sizeof(long)<<endl;
    cout<<W<<"unsigned long:"<<sizeof(unsigned long)<<endl;
    cout<<W<<"long long:"<<sizeof(long long)<<endl;
    cout<<W<<"unsigned long long:"<<sizeof(unsigned long long)<<endl;
    cout<<W<<"float:"<<sizeof(float)<<endl;
    cout<<W<<"double:"<<sizeof(double)<<endl;
    cout<<W<<"long double:"<<sizeof(long double)<<endl;
    return EXIT_SUCCESS;
}
//-----
               bool:1
               char:1
        signed char:1
      unsigned char:1
            wchar_t:2
              short:2
     unsigned short:2
                int:4
       unsigned int:4
               long:4
      unsigned long:4
          long long:8
 unsigned long long:8
              float:4
             double:8
        long double:12
//-----
posted on 2008-11-19 11:47 greedy 阅读(1320) 评论(0)  编辑  收藏 所属分类: Java技术

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