class 和struct差别

#include <stdio.h>
#include <windows.h>

class testclass
{
   int i;
   int j;
public:  
   virtual void kkk();
};

void testclass::kkk()
{
    printf("testclass::kkk test/n");   
}

struct teststruct : public testclass
{
    int i;
    int j;
    void kkk();
};

void teststruct::kkk()
{
    printf("teststruct::kkk test/n");
}

void (*testFunc)();

void initFun(void (*fun)())
{
    testFunc = fun;
   
    printf("call testFunc/n");
    testFunc();
}
 
extern "C" void fun()
{
    printf("call fun/n");
}

int main(int argc, char **argv)
{
    testclass  *pTestClass = new testclass();
    pTestClass->kkk();
   
    //pTestClass->i = 5;  // for i is private
   
    teststruct *pTestStruct = new teststruct();
    pTestStruct->kkk();
    pTestStruct->i = 6;
   
    initFun(fun);
               
    return 1;
}

输出结果:

testclass::kkk test
teststruct::kkk test
call testFunc
call fun

总体看来:　c++ class 和struct差别主要在对成员变量的存取权限上．