遊戲公司C語言面試題

 

 

 

 

#include <iostream>

using namespace std;

 

//apply memories in a function.

void GetMemory(char ** p )

{

*p = (char*)malloc(10);

}

 

/**

* p will be free after GetMemory2 invoked.

*/

char *GetMemory2(void)

{

   char p[] = "hello world";

   return p;

}

/**

* write a function which concat a string to another string without using system library

*/

char * strconcat(char * destStr,const char *  srcStr)

{

char * header = destStr;

while( *destStr !='/0')

{

destStr++;

}

while(*srcStr !='/0')

{

*destStr++ = *srcStr++;

}

*destStr = '/0';

return header;

}

 

int main()

{

//1./*

char * p = NULL;

GetMemory(&p);

strcpy(p,"Hello");

cout<<p<<endl;

free(p); 

//2.

char * p2 = NULL;

p2 = GetMemory2(); 

strcpy(p2,"Hello");

cout<<p2<<endl;

 

//3.

char * str = (char*)malloc(sizeof(100));

free(str);

if(str != NULL)

{

strcpy(str,"world");

cout <<str<<endl;

}

 

//4.

char str1[15] = "Hello";

char * str2 = "World";

strconcat(str1,str2);

cout<<str1<<endl;

return 0;

}