sizeof题解决方法

2012-04-03

sizeof题1、在windows下，写出运行结果，每空2分，共10分。char str[ ] ＂hello＂char *pstrint n10sizeof(

sizeof题
1、在windows下，写出运行结果，每空2分，共10分。
char str[ ]= ＂hello＂;
char *p=str;
int n=10;
sizeof(str)=( )
sizeof(p)=( )
sizeof(n)=( )
void func(char str[100])
{ }
sizeof(str)=( )

[解决办法]

C/C++ code

//数组做参数传递 退化为指针////////////////////关于sizeof计算////////////////////struct {    short a1;    short a2;    short a3;}A;struct {    long a1;    short a2;}B;class STU{    ;};class _STU{public:    int m;    int n;    int a;private:    int x;    int y;    int z;};class NNN{public:    _STU a;//24    STU b; //28private:protected:};class MMM{public:    char a,b;};class WWW{public:    WWW();    ~WWW();};class HHH{public:    HHH();    ~HHH();    char s[100];};class _HHH{public:    _HHH();    ~_HHH();private:    int a[2];//此处8    char s;//此处4    long d;//此处4    char* p;//此处4};char v[10];int test(char v[]){    return sizeof(v);}class GGG{public:    char p;    int dd[3];    float e;};int main(void){    char*  ss1 = "0123456789"        ;    char   ss2[] ="0123456789"        ;    char   ss3[100] = "0123456789"    ;    int    ss4[100]                    ;    char   q1[] = "abc"                ;    char   q2[] = "a\n"                ;    char*  q3 = "a\n"                ;    char*  str1 = (char*)malloc(100);    void*  str2 = (void*)malloc(100);    cout <<sizeof(ss1)<<endl    ;//4    cout <<sizeof(ss2)<<endl    ;//11    cout <<sizeof(ss3)<<endl    ;//100    cout <<sizeof(ss4)<<endl    ;//400    cout <<sizeof(q1)<<endl        ;//4    cout <<sizeof(q2)<<endl        ;//3    cout <<sizeof(q3)<<endl        ;//4    cout <<sizeof(A)<<endl        ;//6    cout <<sizeof(B)<<endl        ;//8 //结构体内存对其    cout <<sizeof(str1)<<endl    ;//4    cout <<sizeof(str2)<<endl    ;//4    cout <<sizeof(STU)<<endl    ;//1    cout <<sizeof(_STU)<<endl    ;//24    cout <<sizeof(NNN)<<endl    ;//28    cout <<sizeof(MMM)<<endl    ;//2    cout <<sizeof(WWW)<<endl    ;//1    cout <<sizeof(HHH)<<endl    ;//100    cout <<sizeof(_HHH)<<endl    ;//20  //内存对其原则 按照4的倍数    cout <<test("1")<<endl        ;//4    cout <<sizeof(GGG)<<endl    ;//20 //内存对其原则 按照4的倍数    return 0;}//2class AA{private:public:protected:};class BB:public AA{public:    int m_x;};int main(void){    BB b1;    cout << sizeof(b1) <<endl;   //4    return 0;}class AA{public:    static int i;};int main(void){    AA a;    cout << sizeof(a) << endl; //1    cout << sizeof(a.i) << endl; //4    return 0;}
[解决办法]
编译器生成32位Windows程序：6 4 4 6（最后一个，如果是在函数里面，那么就是4）

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sizeof题解决方法