Technical / logical interview questions in C language

1.)

main()

{

extern int i;

i=20;

printf("%d",i);

}

Answer:  

Linker Error : Undefined symbol '_i'

Explanation: 

             extern storage class in the following declaration,

                       extern int i;

specifies to the compiler that the memory for i is allocated in some other program and that address will be given to the current program at the time of linking. But linker finds that no other variable of name i is available in any other program with memory space allocated for it. Hence a linker error has occurred .

2.)

main()

{

int i=-1,j=-1,k=0,l=2,m;

m=i++&&j++&&k++||l++;

printf("%d %d %d %d %d",i,j,k,l,m);

}

Answer:

             0 0 1 3 1

Explanation :

Logical operations always give a result of 1 or 0 . And also the logical AND (&&) operator has higher priority over the logical OR (||) operator. So the expression  ‘i++ && j++ && k++’ is executed first. The result of this expression is 0    (-1 && -1 && 0 = 0). Now the expression is 0 || 2 which evaluates to 1 (because OR operator always gives 1 except for ‘0 || 0’ combination- for which it gives 0). So the value of m is 1. The values of other variables are also incremented by 1.

3.)

main()

{

char *p;

printf("%d %d ",sizeof(*p),sizeof(p));

}

Answer: 

             1 2

Explanation:

The sizeof() operator gives the number of bytes taken by its operand. P is a character pointer, which needs one byte for storing its value (a character). Hence sizeof(*p) gives a value of 1. Since it needs two bytes to store the address of the character pointer sizeof(p) gives 2.

4.)

main()

{

int i=3;

switch(i)

{

   default:printf("zero");

   case 1: printf("one");

  break;

  case 2:printf("two");

 break;

 case 3: printf("three");

 break;

 }  

}

Answer :-

three

Explanation :

The default case can be placed anywhere inside the loop. It is executed only when all other cases doesn't match.

5.)

main()

{

 printf("%x",-1<<4);

}

Answer: 

fff0

Explanation :

-1 is internally represented as all 1's. When left shifted four times the least significant 4 bits are filled with 0's.The %x format specifier specifies that the integer value be printed as a hexadecimal value.

ALL PLACEMENT TECHNICAL INTERVIEW C PROGRAMMING LANGUAGE QUESTION  BANCK    

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