Joonghee's Laboratory

char* testFunc14() { char arrStr[5] = "aaaa"; return arrStr; } void tc14() { char* pStr = testFunc14(); printf("%s\n", pStr); } Do you think the upper code works fine? It will not work. For arrStr is useless out of testFunc14(). So, pStr has no data. By the way, how about the case below? void testPrint(char* pStr) { printf(pStr); } int tc17() { char arrStr[5] = "aaaa"; testPri..

In case of C++ class CParent { public: void mPrintf2() { printf("CParent::mPrintf2\n"); } }; class CChild : public CParent { public: void mPrintf2() { printf("CChild::mPrintf2\n"); } }; int main(void) { CParent* l_pObj = new CChild(); l_pObj->mPrintf2(); } => CParent::mPrintf2 If you attach 'virtual' keyword ahead of the mPrintf2 declaration The result is => CChild::m..

void tc4() { switch(1){ case 1: CChild* pObj = new CChild(); break; case 2: break; } } Do you think the upper code is compiled well? When I tried, the compiler showed a message below. ( I used visual studio 2010) 1>.\main.cpp(38) : error C2360: initialization of 'pObj' is skipped by 'case' label When I changed the code like below, void tc4() { switch(1){ case 1: { CChild* p..

void func(void* arg) { printf("%d\n", ((int*)arg)[0]); } void main() { int a = 2; func(&a); } ===> 2

// CParent class CParent { public: CParent() { printf("CParent constructor\n"); } ~CParent() { printf("CParent destructor\n"); } // CChild class CChild : public CParent { public: CChild() { printf("CChild constructor\n"); }; ~CChild() { printf("CChild destructor\n"); } // main function int main(void) { CChild* pObj = new CChild(); delete pObj; return 0; } => // result CPare..

What is the difference between singleton and static class? These are just my opinion. 1. You can use an interface class. In other words, your singleton class can implement interface functions. 2. As you know, memory area is different. A object is stored in heap area and static class is placed in stack. For memory optimization, the singleton way could be useful. 3. In a static ..

int[][] arr = new int[10][80]; System.out.println("arr.length: " + arr.length); System.out.println("arr[0].length: " + arr[0].length); => arr.length: 10 arr[0].length: 80 즉, arr는 10개의 방이 있고 각각의 방에 대해서 80개의 방이 있다는 의미

http://withwani.tistory.com/125 http://blog.naver.com/allisabeth?Redirect=Log&logNo=80012035944

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http://www.yolinux.com/TUTORIALS/LinuxTutorialPosixThreads.html #include <stdio.h> #include <stdlib.h> #include <pthread.h> void *print_message_function( void *ptr ); main() { pthread_t thread1, thread2; // thread id char *message1 = "Thread 1"; char *message2 = "Thread 2"; int iret1, iret2; /* Create independent threads each of which will execute function */ iret1 = pthread_c..