Question

How many iterations of the for loop does this program perform?

int main(void) {
int a[] = {1, 2, 3, 4};
int i;
for (i = 0; i < 4; i++) {
    if (a[i] < 0) return 1;
    else return 0;
}
return 0;
}

Question 1 options:

A	No iterations.
B	The program crashes.
C	One.
D	The program does not compile.
E	Four.

Question 2

What does the following program do?

int main(void) {
  int i, a[];
  a[0]=1;
  for (i=0; i<10; i++) {
    a[i] = a[i-1] + 2*i + 1;
  }
  return 0;
}

Question 2 options:

A	It crashes when it is run because no memory is reserved for the array.
B	It does not compile.
C	It fills the array with the squares of the integers from 1 to 10.
D	It fills the array with the first 10 powers of 2.

Question 3

What's the problem with this code?

int main(void) {
  int i, a[5];
  for (i=1; i <= 5; i++) {
    a[i] = i+1;
  }
  return 0;
}

Question 3 options:

A	The main problem is that the loop accesses a non-existing a[5]. This will cause some memory location to be inadvertently written. The secondary problem is that a[0] is left uninitialized.
B	It doesn't compile because one cannot declare an int variable and an int array on the same line.
C	There is no problem. The code will run just fine.
D	It crashes because a[1] is accessed before a[0].

Question 4

If a is declared with

  int a[10];

what value does sizeof(a) have?

Question 4 options:

A	14
B	Whatever is the size of a pointer to an integer.
C	10
D	10*sizeof(int)

Question 5

What does the following program do?

#include 
int main(void) {
  int a[] = {1,2,3,4};
  int b[4];  b = a;
  printf("%4d\n", b);
  return 0;
}

Question 5 options:

A	It prints 1 2 3 4.
B	The program incurs a segmentation fault when run.
C	It does not compile. You cannot copy arrays like that.
D	It does not compile. You cannot print an entire array like that.

question 6

Arrays are just pointers in disguise.

Question 6 options:

A	True
B	False

Question 7

Declaring too large an array in a function may cause a stack overflow when the function is called.

Question 7 options:

A	True
B	False

Question 8

What does the following program do?

int main(void) {
  int a[4];
  a = {1,2,3,4};
  return a[3];
}

Question 8 options:

A	It crashes because main can only return 0.
B	It returns 3.
C	It returns 4.
D	It does not compile.

Question 9

What does the following program do?

#include 

int main(void) {
  int i = 2;
  int a[] = {0,1,2,3,4};
  int n = sizeof(a) / sizeof(a[0]);
  for (i = 0; i < n; i++) {
    (*(a+i))++;
    printf(" %d", a[i]);
  }
  printf("\n");
  return 0;
}

Question 9 options:

A	It does not compile.
B	It prints: 1 1 1 1 1
C	Prints: 1 2 3 4 5.
D	It crashes because it causes a segmentation fault.

Question 10

What does the following program do?

#include 

int main(void) {
  int * p;
  int a[] = {0,1,2,3,4};
  int n = sizeof(a) / sizeof(a[0]);
  for (p = a; p != a+n; p++) {
    printf(" %d", *p);
  }
  printf("\n");
  return 0;
}

Question 10 options:

A	It crashes because p != a+n accesses an address that isout of bounds.
B	It doesn't compile. You cannot assign an array to a pointer because they are of different types.
C	It prints nonsense because %d is for integers, while p is a pointer.
D	It prints: 0 1 2 3 4

Answer 1

Q1:

C.One

Explanation:When it enters in loop for first time,it checks condition then it fails and cause to return 0.Hence it terminates loop as well as code

====================================================================

Question 2:

Ans:

A	It crashes when it is run because no memory is reserved for the array. expanation:It is neccessary to give size of array otherwise causes syntax error ===============================================================================

Q3:

Ans:

C

There is no problem. The code will run just fine. Explanation :As there is no syntax error ,code runs fine .There may be run time error or exception when we try do operations on array ================================================================================= Q.4 Ans:d 10sizeof(int) Expanation:Above will give 40 because 10 * 4(size of int is 4) which is same as sizeof(a) as a is array of 10 integers