定义字符指针char *str="hello",已知sizeof(str)=4,则strlen(str)=______。

以下为 Windows NT 下的 32位 C++程序，请计算 sizeof的值

char str[] = “Hello” ; char *p = str ;int n = 10;请计算 sizeof (str )

= sizeof ( p ) = sizeof ( n ) = void Func (

char str[100]){请计算 sizeof( str ) = }

void *p = malloc( 100 );请计算 sizeof ( p ) =

执行下列语句后，输出结果为steven的是 Char * str="steven"; cout. write(str, )；

A．strlen(str)

B．sizeof(str)

C．strlen(str+1)

D．sizeof(str-1)

下面的程序各自独立，请问执行下面的四个TestMemory 函数各有什么样的结果?

①void GetMemory(char * p)

{

p = (char * )malloc(100);

}

void TestMemory (void)

{

char *str = NULL;

GetMemory (str);

strcpy(str, "hello world");

prinff(str);

}

② char * GetMemory (void)

{

char p[ ] = "hello world";

return p;

}

void TestMemory (void)

{

char * str = NULL;

str = GetMemory( );

printf(str);

}

③void GetMemory(char * * p, int num)

{

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

}

void TestMemory (void)

{

char * str = NULL;

GetMemory(&str, 100);

strcpy( str, "hello" );

printf(sir);

}

④void TestMemory (void)

{

char *str = (char * )malloe(100);

strepy (str, "hello" );

free ( str );

if(str ! = NULL)

{

strepy( str, "world" );

printf(str);

}

}