Frequently Asked Questions in Technical Round at MNCs like TCS, WIPRO, INFOSYS,..etc – 13

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

1)

#include<stdio.h>

main()

{

  int a[2][2][2] = { {10,2,3,4}, {5,6,7,8}  };

  int *p,*q;

  p=&a[2][2][2];

  *q=***a;

  printf("%d..%d",*p,*q);

}

Answer:

garbagevalue..1

Explanation:

p=&a[2][2][2]  you declare only two 2D arrays. but you are trying to access the third 2D(which you are not declared) it will print garbage values. *q=***a starting address of a is assigned integer pointer. now q is pointing to starting address of a.if you print *q meAnswer:it will print first element of 3D array.

2)

#include<stdio.h>

main()

{

   const int i=4;

   float j;

   j = ++i;

   printf("%d  %f", i,++j);

 }

Answer:

Compiler error

Explanation:

i is a constant. you cannot change the value of constant

3)

#include<stdio.h>

main()

{

    register i=5;

    char j[]= "hello";

    printf("%s  %d",j,i);

}

Answer:

hello 5

Explanation:

if you declare i as register  compiler will treat it as ordinary integer and it will take integer value. i value may be  stored  either in register  or in memory.