C language placement problem with solution

1)

#define assert(cond) if(!(cond)) \

  (fprintf(stderr, "assertion failed: %s, file %s, line %d \n",#cond,\

 __FILE__,__LINE__), abort())

void main()

{

int i = 10;

if(i==0)

    assert(i <>

else

    printf("This statement becomes else for if in assert macro");

}

Answer:

No output

Explanation:

The else part in which the printf is there becomes the else for if in the assert macro. Hence nothing is printed. 

The solution is to use conditional operator instead of if statement,

#define assert(cond) ((cond)?(0): (fprintf (stderr, "assertion failed: \ %s, file %s, line %d \n",#cond, __FILE__,__LINE__), abort()))

Note:

However this problem of “matching with nearest else” cannot be solved by the usual method of placing the if statement inside a block like this,

#define assert(cond) { \

if(!(cond)) \

  (fprintf(stderr, "assertion failed: %s, file %s, line %d \n",#cond,\

 __FILE__,__LINE__), abort()) \

}

2)

Is the following code legal?

struct a

    { 

int x;

 struct a b;

    }

Answer:

No

Explanation:

Is it not legal for a structure to contain a member that is of the same

type as in this case. Because this will cause the structure declaration to be recursive without end.

3)

Is the following code legal?

struct a

    { 

int x;

            struct a *b;

    }

Answer:

Yes.

Explanation:

*b is a pointer to type struct a and so is legal. The compiler knows, the size of the pointer to a structure even before the size of the structure

is determined(as you know the pointer to any type is of same size). This type of structures is known as ‘self-referencing’ structure.

4)

Is the following code legal?

 typedef struct a

    { 

  int x;

 aType *b;

    }

aType

Answer:

No

Explanation:

The typename aType is not known at the point of declaring the structure (forward references are not made for typedefs).

5)

Is the following code legal?

typedef struct a aType;

struct a

{ 

int x;

aType *b;

};

Answer:-

Yes

Explanation:

The typename aType is known at the point of declaring the structure, because it is already typedefined.

ALL PLACEMENT TECHNICAL INTERVIEW QUESTION  BANCK   

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