C/C++程序员应聘常见面试题深入剖析(2)

void strcpy( char *strDest, const char *strSrc ) 
//将源字符串加const，表明其为输入参数，加2分 
{ 
while( (*strDest++ = * strSrc++) != ‘\0’ ); 
} 

void strcpy(char *strDest, const char *strSrc) 
{ 
//对源地址和目的地址加非0断言，加3分 
assert( (strDest != NULL) &&(strSrc != NULL) ); 
while( (*strDest++ = * strSrc++) != ‘\0’ ); 
} 

//为了实现链式操作，将目的地址返回，加3分! 
char * strcpy( char *strDest, const char *strSrc ) 
{ 
assert( (strDest != NULL) &&(strSrc != NULL) ); 
char *address = strDest; 
while( (*strDest++ = * strSrc++) != ‘\0’ ); 
return address; 
} 

 int strlen( const char *str ) //输入参数const

{ 
assert( strt != NULL ); //断言字符串地址非0 
int len; 
while( (*str++) != '\0' ) 
{ 
len++; 
} 
return len; 
} 

void GetMemory( char *p ) 
{ 
p = (char *) malloc( 100 ); 
} 
void Test( void ) 
{ 
char *str = NULL; 
GetMemory( str ); 
strcpy( str, "hello world" ); 
printf( str ); 
}