【读书笔记】c专家编程

// test_C.cpp : 定义控制台应用程序的入口点。

//

#include "stdafx.h"

#include <iostream>

using namespace std;

void PrintChar(int i);

const int two = 2;

int order = 0;

void Gen_init(char *string)//防止数组最后出现逗号（,）的方法

{

static char sep = ' ' ;//static类型

cout << sep << " " << string << endl;

sep = ',';

}

int f()

{

cout << "f:" << ++order << endl;

return 1;

}

int g()

{

cout << "g:" << ++order << endl;

return 2;

}

int h()

{

cout << "h:" << ++order << endl;

return 3;

}

int g(int a, int b)

{

if(a%b == 0)

return b;

else

g(b, a%b);

}

struct SA{

int a;

char b;

double c;

};//sizeof == 16

struct SB{

int a;

double c;

char b;

};// sizeof == 24

#pragma pack(push) //保存对齐状态

#pragma pack(4) //设定为字节对齐

struct SC

{

char m1;

double m4;

int m3;

};// sizeof == 16(n==4); sizeof == 24(n==8,16,24....)

#pragma pack(pop)//恢复对齐状态

struct StructArray{//数组封装在结构体中的妙用

int a[10];

};

union BIT32{//联合的妙用

int i;

struct{char c0,c1,c2,c3;}byte;

};

typedef struct StructArray Array;

bool StrEqu(const char* const str1, const char* const str2)//将strcmp封装成这样更好

{

return !strcmp(str1,str2);

}

int p[10] = {1,2,3,4,5,6,7,8,9,0};

void AutoChangeType(float i);

void AutoChangeType(float i)

{

printf("%f/n",i);

}

int bss[100];

int data[100] = {1,2,3,4,5,6,7,8,9,0,11};

int _tmain(int argc, _TCHAR* argv[])

{

AutoChangeType(100);

int *pc = p;

cout << "指针本身的地址：" << &pc << endl

<< "指针所指的地址：" << pc << endl

<< "指针所指的数组第一个元素的地址：" << &pc[0] << endl

<< "指针所指的数组第一个元素的值：" << *pc << endl;

PrintChar(5);

if(StrEqu("abc","abc"))

cout << "Yes" << endl;

else

cout << "No" << endl;

BIT32 bb;

bb.i = 0x12345678;

cout << hex << bb.i << " "

<< (int)bb.byte.c0 << " "

<< (int)bb.byte.c1 << " "

<< (int)bb.byte.c2 << " "

<< (int)bb.byte.c3 << endl;

Array arr1, arr2;

for(int ii=0; ii<10; ++ii)

arr1.a[ii] = ii;

arr2 = arr1;

for(int ii=0; ii<10; ++ii)

cout << arr2.a[ii] << " ";

cout << endl;

cout << sizeof(SA) << " " << sizeof(SB) << " " << sizeof(SC) << endl;

int a,b;

//cin >> a >> b;

//cout << g(a,b) << endl;

int *pa = new int(10);

int *pb = new int(2);

*pa = *pa / *pb;// /后必须有空格

char line[10];

//gets(line);//小心溢出

//cout << line << endl;

int i=0;

//std::cin >> i;

switch(i)

{

case 1:

std::cout << 1 << std::endl;

break;

case two:

std::cout << 2 << std::endl;

break;

default:

;

}

printf("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"

"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"

"cccccccccccccccccccccccccccccccccccccccccccccccc/n");//3字符串自动合并成串

for(int i=0; i<3; ++i)

Gen_init("abc");

int x = f() + g() * h();//不同的编译器，fgh的调用顺序可能不同

cout << x << endl;

return 0;

}

//extern int* p;

extern int p[];

void PrintChar(int i);

void PrintChar(int i)

{

cout << p << endl;

cout << &p[i] << endl;

cout << p[i] << endl;

}

#include <stdio.h>

void AA(void)

{

printf("Oh my God, Dangerous!/n");

}

void ChangeReturn(int i)

{

printf("%d/n",i);

__asm

{

lea edi, [esp+34h*4] // 获得函数返回地址在栈中的地址

mov ecx, [edi] //保存返回地址

mov [edi+4], ecx //将返回地址移到参数i在栈中的位置（覆盖参数）

lea esi, AA

mov [edi], esi//更改返回地址为函数AA

}

}

int main()

{

ChangeReturn(100);

printf("return to Main/n");

__asm

{

sub esp,4

}

return 0;

}

int main()

{

try{

int *pp = new int[10];

pp[-1] = 10;

pp[20] = 20;

cout << pp[-1] << " " << pp[20] << endl;

strcpy(0,"aaa");

__asm

{

mov edi, 0;

mov [edi], 5;

}

union U{

char a[10];

int i;

}u;

cout << sizeof(U) << endl;

int *p = (int*)(&u.a[1]);

*p = 0xffffffff;

for(int i=0; i<100; ++i)

cout << (int)u.a[i] << " ";

cout << endl;

int MB = 0;

//while(malloc(1 << 20)) ++MB;

printf("Allocated %d MB total/n", MB);

}

catch(...)

{

cout << "Exception" << endl;

}

return 0;

}

__setjmp3:

1027F608 mov edx,dword ptr [esp+4]

1027F60C mov dword ptr [edx],ebp

1027F60E mov dword ptr [edx+4],ebx

1027F611 mov dword ptr [edx+8],edi

1027F614 mov dword ptr [edx+0Ch],esi

1027F617 mov dword ptr [edx+10h],esp

1027F61A mov eax,dword ptr [esp]

1027F61D mov dword ptr [edx+14h],eax

1027F620 mov dword ptr [edx+20h],56433230h

1027F627 mov dword ptr [edx+24h],0

1027F62E mov eax,dword ptr fs:[00000000h]

1027F634 mov dword ptr [edx+18h],eax

1027F637 cmp eax,0FFFFFFFFh

1027F63A jne _s3_get_count (1027F645h)

1027F63C mov dword ptr [edx+1Ch],0FFFFFFFFh

1027F643 jmp _s3_done (1027F680h)

_longjmp:

10283554 push ebp

10283555 mov ebp,esp

10283557 sub esp,50h

1028355A mov ebx,dword ptr [esp+58h]

1028355E mov dword ptr [ebp-50h],80000026h

10283565 mov dword ptr [ebp-4Ch],0

1028356C mov dword ptr [ebp-48h],0

10283573 mov dword ptr [ebp-44h],0

1028357A mov dword ptr [ebp-40h],0

10283581 lea eax,[ebp-50h]

10283584 mov ebp,dword ptr [ebx]

10283586 mov esi,dword ptr [ebx+18h]

10283589 cmp esi,dword ptr fs:[0]

10283590 je _lj_local_unwind (102835A4h)

10283592 push ebx

10283593 push esi

10283594 push 0

10283596 push eax

10283597 push offset _lj_return (102835A2h)

1028359C push esi

1028359D call RtlUnwind (1023B78Ah)