C Language Interview Questions And Answers

1)  

main()

{

 char *p;

 p="Hello";

 printf("%c\n",*&*p);

}

Answer:

H 

Explanation:

* is a dereference operator & is a reference  operator. They can be    applied any number of times provided it is meaningful. Here  p points to  the first character in the string "Hello". *p dereferences it and so its value is H. Again  & references it to an address and * dereferences it to the value H.

2) main()

{

    int i=1;

    while (i<=5)

    {

       printf("%d",i);

       if (i>2)

 goto here;

       i++;

    }

}

fun()

{

   here:

     printf("PP");

}

Answer:

Compiler error: Undefined label 'here' in function main

Explanation:

Labels have functions scope, in other words The scope of the labels is limited to functions . The label 'here' is available in function fun() Hence it is not visible in function main.

3)

main()

{

   static char names[5][20]={"pascal","ada","cobol","fortran","perl"};

    int i;

    char *t;

    t=names[3];

    names[3]=names[4];

    names[4]=t;

    for (i=0;i<=4;i++)

     printf("%s",names[i]);

}

Answer:

Compiler error: Lvalue required in function main

Explanation:

Array names are pointer constants. So it cannot be modified.

4) void main()

{

int i=5;

printf("%d",i++ + ++i);

}

Answer:

Output Cannot be predicted  exactly.

Explanation:

Side effects are involved in the evaluation of   i

5) void main()

{

int i=5;

printf("%d",i+++++i);

}

Answer:

Compiler Error 

Explanation:

The expression i+++++i is parsed as i ++ ++ + i which is an illegal combination of operators. 

ALL PLACEMENT TECHNICAL INTERVIEW QUESTION  BANCK   

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