Indian Institute of Technology Patna
Date: 20 May 2022
Midsem: CS102: Programming & Data Structure
Duration: 2 hours
Full Marks 80
(A) 10 20 30 40 50 60 70 80 90 100
(B) Garbage number is printed unlimited number of
times(answer)
(C) 10 30 50 70 90
(D) Compiler error
Instruction: Q1-16, 5 marks each. 1 mark will be deduced
for each wrong answer. All options should be written on the
table provided in the last page. Evaluation will be based Q(3) What this code is trying to compute?
only on that table. Assume #include < stdio.h > and other
int main(){
required header files are included for all questions. No doubts
int n,x,y=0,i,k,flag, *arr;
would be entertained. Write suitable assumptions, if necessary.
printf("enter value of n\n");
scanf("%d",&n);
Q(1) Predict output of following code?
arr=(int*)malloc((n-1)*sizeof(int));
for(i=0;i<(n-1);i++){
int main()
srand(time(0));
{
do{
int i,j,flag1=0,flag2=0,x;
flag=0;
int arr[8]={-1,3,-5,7,8,9,-2,-7};
x=rand()%n;
for(i=0,j=7;i<8,j>=0;)
x=x+1;
{
for(k=0;k<i;k++)
if(arr[i]>=0)
if(arr[k]==x)
flag1=1;
flag=1;
else
}while(flag==1);
i++;
arr[i]=x;
if(arr[j]<0)
printf("%d ",x);
flag2=1;
y+=x;
else
}
j--;
printf("\n%d\n",n*(n+1)/2-y);
if(flag1 && flag2)
return 0;
{
}
x=arr[i];
arr[i]=arr[j];
(A) Program is trying to generate (n-1) random number
arr[j]=x;
and finding sum of those numbers
i++;
(B) Program is trying to generate (n-1) random numbers
j--;
in the range of 1 to n and try to compute missing
flag1=0;
number
flag2=0;
(C) Program is trying to generate (n-1) unique random
}
numbers in the range of 1 to n and try to compute
}
missing number (answer)
for(i=0;i<8;i++)
printf("%d ",arr[i]);
(D) none of the above
return 0;
}
(A)
(B)
(C)
(D)
3 7 9 8 -2 -5 -7 -1 (answer)
-1 -7 -5 -2 8 9 7 3
-7 -5 -2 -1 3 7 8 9
3 7 8 9 -7 -5 -2 -1
Q(2) Predict output of following code?
void main()
{
int i, j=10;
for(;;)
{
printf("%d ",i*j);
i++;
}
}
1
Q(4) Predict output of following code?
Q(7) Predict output of following code?
int fun(int arr[], int n)
{
int res = 0, i;
for (i = 0; i < n; i++)
int main()
{
int n;
for (n = 9; n!=0; n--)
printf("n = %d", n--);
return 0;
}
res∧ = arr[i];
return res;
}
int main(void)
{
int arr[] = { 5, 5, 7, 3, 7, 3, 9 };
int n = sizeof(arr) / sizeof(arr[0]);
printf("%d", fun(arr, n));
return 0;
}
(A) 9 8 7 6 5 4 3 2 1
(B) Infinite Loop (answer)
(C) 9 7 5 3 1
(D) 9 7 5 3
Q(8) Predict output of following code?
int main()
{
int i = 0;
for (i=0; i<20; i+=2)
{
switch(i)
{
case 0: i += 1;
case 1: i += 2;
case 3: i += 3;
default: i += 4; break;
}
printf("%d ", i);
}
return 0;
}
(A) 4
(B) 3
(C) 7
(D) 9 (answer)
Q(5) Predict output of following code?
int main()
{
int x = 11, y = 7;
x = x∧ y;
y = x∧ y;
x = x∧ y;
printf(" x =%d, y=%d",x,y);
return 0;
(A) 16 21
}
(B) 10 16 22 (answer)
(A) x=7,y=11(answer)
(C) 1 6 12 18
(B) x=11,y=7
(D) Compilation Error
(C) x=18,y=4
Q(9) Predict output of following code?
(D) x=4,y=18 loop loop loop
int main()
{
int a[5] = {1,2,3,4,5};
int *ptr = a+2;
printf("%d %d", *(ptr+2), *(ptr-1));
return 0;
}
Q(6) Predict output of following code?
int main()
{
int i = 1024;
for (; i; i >>= 1)
printf("Hi");
return 0;
}
(A) Compilation error
(B) Run time error
(A) “hi” will be printed for 11 times (answer)
(C) 5 2 (answer)
(B) “hi” will be printed for 1024 times
(D) 4 1
(C) “hi” will be printed for 10 times
(D) Compile Time Error
2
Q(10) Predict output of following code?
Q(13) Predict output of following code?
int main()
{
int x=3,y=5,z;
z=(x<y)?(y-x): (x-y);
printf("z=%d",z);
return 0;
}
(B) z=5
int main()
{
int x=3;
do
{
printf("IITP");
x--;
}while(x<7);
return 0;
}
(C) z=2(answer)
(A) IITP is printed unlimited number of times(answer)
(D) z=-2
(B) IITP
(A) z=3
(C) No output
Q(11) What is the output of following code?
(D) Compiler error
int main()
{
while(True)
{
printf("IITP");
break;
}
return 0;
}
Q(14) Predict output of following code?
int main()
{
for(int i=1,j=10;i<11;i=i+1)
{
printf("%d ",i++*j);
}
return 0;
}
(A) IITP
(B) IITP is printed unlimited number of times.
(A) 10 20 30 40 50 60 70 80 90 100
(C) No output
(B) 10 30 50 70 90(answer)
(D) Compiler error(answer)
(C) 20 40 60 80 100
Q(12) Predict output of following code?
int main()
{
int x=3;
while(x=7)
{
printf("IITP\n");
break;
}
printf("CS102");
return 0;
}
(D) Compiler error
Q(15) Predict output of following code?
int main()
{
int x = 1, y = 2, z = 3;
{
int x = 10;
float y = 20;
printf(" x = %d, y = %f, z = %d \n", x, y, z);
{
int z = 100;
(A) IITP
(B) CS102
}
(C) Compiler error
}
(D) IITP
CS102(answer)
return 0;
}
(A) x = 1, y = 2, z = 3
(B) x = 1, y = 2, z = 3
(C) x = 10, y = 20.0, z = 3 (answer)
(D) x = 10, y = 20.0, z = 100
3
Q(16) Predict the value of variable ‘sa’ at the end of the
program
Question #
Option #/Output
1
2
void foo()
{
3
int a = 10;
static int sa = 10;
4
a += 5;
sa += 3;
6
5
7
8
printf("a = %d, sa = %d\n", a, sa);
9
}
10
void main()
{
system("cls");
int i;
11
12
13
14
for (i = 0; i < 10; ++i)
foo();
15
}
16
(A) 30
(B) Depends on compiler
(C) 10
Name (in Capital):
(D) 40 (answer)
Roll No:
Signature:
Phone Number:
Midsem, CS102, 20 May 2022
For Office Use:
No. of
No. of
Total (80)
4
Correct A (1-16)
Wrong A (1-16)
*5
*-1