c++中sizeof的用法

 /*测试sizeof()  测试环境：windows 7  64位操作系统    VS2012编译器 */
 #include <iostream>
 using namespace std;

 int main()
 {
     char a;
     short int b;
     int c;
     long int d;
     float e;
     double f;
     long double g;
     int* h;
     double* i;
     float* j;
     string strArr1;

     cout << "sizeof(char) = " << sizeof(a) << endl;
     cout << "sizeof(short int) = " << sizeof(b) << endl;
     cout << "sizeof(int) = " << sizeof(c) << endl;
     cout << "sizeof(long int) = " << sizeof(d) << endl;
     cout << "sizeof(float) = " << sizeof(e) << endl;
     cout << "sizeof(double) = " << sizeof(f) << endl;
     cout << "sizeof(long double) = " << sizeof(g) << endl;
     cout << "sizeof(int*) = " << sizeof(h) << endl;
     cout << "sizeof(double*) = " << sizeof(i) << endl;
     cout << "sizeof(float*) = " << sizeof(j) << endl;
     cout << "sizeof(string) = " << sizeof(strArr1) << endl;

     system("pause");

     return ;
 }

测试结果：