Frequently Asked Questions in Technical Round at MNCs like TCS, WIPRO, INFOSYS,..etc

Predict the output or error(s) for the following:

1)

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.

2)

void main()

{

 char far *farther,*farthest;

 printf("%d..%d",sizeof(farther),sizeof(farthest));

 }

Answer:

4..2

Explanation:

the second pointer is of char type and not a far pointer

3)

main()

{

 int i=400,j=300;

 printf("%d..%d");

}

Answer:

400..300

Explanation:

printf takes the values of the first two assignments of the program. Any number of printf's may be given. All of them take only the first two values. If more number of assignments given in the program,then printf will take garbage values.

4)

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.