ISRO Scientist or Engineer Computer Science May 2017

Instructions

For the following questions answer them individually

Question 61

In software maintenance tackling the changes in the hardware or software environment where the software works, is

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Question 62

What will be the output of the following C code?
#include <stdio.h>
main( )
{
int i;
for ( i=0; i<5; i++ )
{
int i = 10;
printf ( “ %d”, i );
i++;
}
return 0;
}

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Question 63

What does the following program do when the input is unsigned 16-bit integer?
#include <stdio.h>
main( )
{
unsigned int num;
int i;
scanf (“%u”, &num);
for ( i = 0; i<16; i++)
{
printf (“%d”, (num << i & 1 << 15 ) ? 1:0);
}
}

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Question 64

What is the output of the following program?
#include <stdio.h>
int tmp=20;
main( )
{
printf("%d ",tmp);
func( );
printf("%d ",tmp);
}
func( )
{
static int tmp=10;
printf("%d ",tmp);
}

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Question 65

Which product metric gives the measure of the average length of words and sentence in documents?

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Question 66

Consider a disk system with 100 cylinders. The request to access the cylinders occur in the following sequences
4, 37, 10, 7, 19, 73, 2, 15, 6, 20
Assuming the head is currently at cylinder 50, what is the time taken to satisfy all requests if it takes 1 ms to move from one cylinder to adjacent one and shortest seek time first algorithm is used

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Question 67

A B-Tree used as an index for a large database table has four levels including the root node. If a new key is inserted in this index, then the maximum number of nodes that
could be newly created in the process are

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Question 68

A critical region

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Question 69

Choose the equivalent prefix form of the following expression
$$\frac{(a + (b − c))* ((d − e)}{(f + g − h))}$$

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Question 70

We use malloc and calloc for

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