ISRO CS 2015

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Question 1

If n has 3, then the statement a[++n]=n++;

  • assigns 3 to a[5]

  • assigns 4 to a[5]

  • assigns 4 to a[4]

  • what is assigned is compiler dependent

Question 2

The for loop 

for (i=0; i<10; ++i)
printf("%d", i&1);

prints:

  • 0101010101

  • 0111111111

  • 0000000000

  • 1111111111

Question 3

The output of the following program is 

main()
{
static int x[] = {1,2,3,4,5,6,7,8}
int i;
for (i=2; i<6; ++i)
x[x[i]]=x[i];
for (i=0; i<8; ++i)
printf("%d", x[i]);
}

  • 1 2 3 3 5 5 7 8

  • 1 2 3 4 5 6 7 8

  • 8 7 6 5 4 3 2 1

  • 1 2 3 5 4 6 7 8

Question 4

Consider the following program fragment i=6720; j=4; while (i%j)==0 { i=i/j; j=j+1; } On termination j will have the value

  • 4

  • 8

  • 9

  • 6720

Question 5

Consider the following program fragment 

if(a > b)
if(b > c)
s1;
else s2;

s2 will be executed if

  • a <= b

  • b > c

  • b >= c and a <= b

  • a > b and b <= c

Question 6

What will be output of following program?

C 
#include <stdio.h>

union Data {
    int i;
    float f;
};

int main() {
    union Data d;
    d.i = 10;
    d.f = 20.5;
    printf("%d", d.i);
    return 0;
}

  • 10

  • 20

  • Garbage value

  • Compilation error

Question 7

Consider the following statements 

#define hypotenuse (a, b) sqrt (a*a+b*b);

The macro call hypotenuse(a+2,b+3);

  • Finds the hypotenuse of a triangle with sides a+2 and b+3

  • Finds the square root of (a+2)2 and (b+3)2

  • Is invalid

  • Find the square root of 3*a + 4*b + 5

Question 8

In a lottery scheduler with 40 tickets, how we will distribute the tickets among 4 processes and such that each process gets 10%, 5%, 60% and 25% respectively? 

     P1   P2   P3   P4
a)   12   4    70   30
b)   7    5    20   10
c)   4    2    24   10
d)   8    5    40   30

  • a

  • b

  • c

  • d

Question 9

Suppose a system contains n processes and system uses the round-robin algorithm for CPU scheduling then which data structure is best suited for ready queue of the process

  • stack

  • queue

  • circular queue

  • tree

Question 10

A certain population of ALOHA users manages to generate 70 request/sec. If the time is slotted in units of 50 msec, then channel load would be

  • 4.25

  • 3.5

  • 350

  • 450

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