Re: [問題] C的考題
※ 引述《jcwilliam (william)》之銘言：
: 話說原PO今天參加筆試，遇到一題，想請教版上各位先進
:
: 遇到的問題： (題意請描述清楚)
: 有一個 main method 如下：
: int main(){
: cout<<"Hello Everyone!!"<<endl;
: return 0;
: }
: 題目的問題是，如何在不更改main method 內容的前提下，
: 使得輸出的畫面如下：
: Hey, I am coming.
: Hello Everyone!!
: Good bye.
:
: 關於這題，小弟當時想破了頭也想不出該如何改寫？
: 不知各位先進能否提供正確解答...
: Thanks in advance.
:
:
:
用 Windows 的 DLL 機制也可以做到 (其他作業系統怎麼用我不知道...)
// filename: main.cpp
// compile with: cl.exe main.cpp
#include <iostream>
using namespace std;
#pragma comment(lib, "dll.lib")
extern "C" {
__declspec(dllimport) void foo(void);
}
void bar() {
foo();
}
int main() {
cout<<"Hello Everyone!!"<<endl;
return 0;
}
分隔線分隔線分隔線分隔線分隔線分隔線分隔線分隔線分隔線分隔線
/*
filename: dll.c
compile with: cl.exe dll.c /LD
Reference: http://msdn.microsoft.com/en-us/library/ms682583.aspx (DLLMain)
*/
#include <windows.h>
#include <stdio.h>
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) {
if (fdwReason == DLL_PROCESS_ATTACH) {
printf("Hey, I am coming.\n");
} else if (fdwReason == DLL_PROCESS_DETACH) {
printf("Good bye.\n");
}
return TRUE;
}
__declspec(dllexport) void foo(void) {
printf("foo()..\n");
}
執行結果如下
D:\Desktop>main.exe
Hey, I am coming.
Hello Everyone!!
Good bye.
D:\Desktop>
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CRT 實作原理 (在調用 main() 之前先呼叫 _cinit 與 _initterm 函數)
http://blog.csdn.net/peteryxk/archive/2005/01/31/275564.aspx
※ 編輯: purpose 來自: 124.8.133.69 (11/29 00:13)
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