size.cpp

来自「压缩包里有教材<<C++模式设计-基于QT4开源跨平台开发框架&gt」· C++ 代码 · 共 41 行

#include <assert.h>
#include <iostream>
#include <string>

int main(int argc, char* argv[]) {
    using namespace std;
    int i=0;
    char array1[34] = "This is a dreaded C array of char";
    char array2[] = "if not for main, we could avoid it entirely.";
    char *charp = array1; /* pointer to first element of array */
    string stlstring = "This is an Standard Library string. Much preferred." ;
    assert (sizeof(i) == sizeof(int));
    cout << "sizeof char = " << sizeof(char) << '\n';
    cout << "sizeof wchar_t = " << sizeof(wchar_t) << '\n';
    cout << "sizeof int = " << sizeof(int) << '\n';
    cout << "sizeof long = " << sizeof(long) << '\n';
    cout << "sizeof float = " << sizeof(float) << '\n';
    cout << "sizeof double = " << sizeof(double) << '\n';
    cout << "sizeof double* = " << sizeof(double*) << '\n';
    cout << "sizeof array1 = " << sizeof(array1) << '\n';
    cout << "sizeof array2 = " << sizeof(array2) << '\n';
    cout << "sizeof stlstring = " << sizeof(stlstring) << endl;
    cout << "length of stlstring= " << stlstring.length() << endl;
    cout << "sizeof char* = " << sizeof(charp) << endl;
    return 0;
}
/*OUT
  sizeof char = 1
  sizeof wchar_t = 4
  sizeof int = 4
  sizeof long = 4
  sizeof float = 4
  sizeof double = 8
  sizeof double* = 4
  sizeof array1 = 34
  sizeof array2 = 46
  sizeof stlstring = 4
  length of stlstring= 38
  sizeof char* = 4
*/