C Programming MCQ with Answers Set-1

1. Consider the following C program.

#include<stdio.h>

struct Ournode{

char x,y,z;

};

int main(){

struct Ournode p = {'1', '0', 'a'+2};

struct Ournode *q = &p;

printf ("%c, %c", *((char*)q+1), *((char*)q+2));

return 0;

}

The output of this program is:

2. Consider the following ANSI C program :

Int main() {

Integer x;

Return 0;

Which one of the following phases in a seven-phase C compiler will throw an error?

3. Consider the following ANSI C program.
#include <stdio.h>
Int main(){
Int arr[4][5];
Int i, j;
For (i=0; i<4; i++){
For (j=0; j<5; j++){
arr[i][j]=10*i+j;
}
}
printf(“%d”, *(arr[1]+9));
return 0;
}

4.

Consider the following ANSI C code segment:
Z=x+3+y->f1+y->f2;
For (i=0; i<200: i=i+2){
If (z>i){
p=p+x+3;
q=q+y->f1;
} else {
p=p+y->f2;
q=q+x+3;
}
}
Assume that the variable y points to a struct (allocated on the heap) containing two fields f1 and f2, and the local variables x, y, z, p, q, and i are allotted registers. Common sub-expression elimination (CSE) optimization is applied on the code. The number of addition and dereference operations (of the form y->f1 or y->f2) in the optimized code, respectively, are:

5.

Consider the following C function.

void convert (int n) {

if(n<0)

printf ( %d”, n);

else {

convert(n/2);

printf(n%d",n%2);

Which one of the following will happen when the function convert is called with any positive integer n as argument?

6.

Consider the following C program:

#include <stdio.h>

int r () {

static int num=7;

}

return num--;

}

int main() {

for (r();r();r())

printf("%d", r.());

return 0;

}

Which one of the following values will be displayed on the execution of the programs?

7.

Consider the following C program:

#include<stdio.h>

void fun1(char *s1, char *s2){

char *tmp;

tmp = s1;

s1 = s2;

s2 = tmp;

}

void fun2(char **s1, char **s2){

char *tmp;

tmp = *s1;

*s1 = *s2;

*s2 = tmp;

}

int main(){

char *str1 = "Hi", *str2 = "Bye";

fun1(str1, str2); printf("%s %s ", str1, str2);

fun2(&str1, &str2); printf("%s %s", str1, str2);

return 0;

}

The output of the program above is

8. Consider the following C code. Assume that unsigned long int type length is 64 bits.

unsigned long int fun (unsigned long int n) {

unsigned long int i, j = 0, sum = 0;

for (i = n; i > 1; i = i/2) j++;

for ( ; j > 1; j = j/2) sum++;

return(sum);

}

The value returned when we call fun with the input 240 is

9. Consider the following ANSI C program.

#include(stdio.h)

int main ()

{

int i, j, count;

Count=0;

i=0;

for (j=-3; j<=3; j++)

{

If ((j>=0) && (i++))

count=count+i;

printf(“%d”), count);

return 0;

}

Which one of the following options is correct?

10. The following C program is executed on a Unix/Linux system:

#include <unistd.h>

int main()

{int i;

for (i=0; i<10; i++)

if (i%2 == 0) fork();

return 0;

}

The total number of child processes created is____________.

 

11. Consider the following C program:

#include <stdio.h>

int jumble(int x, int y) {

x=2*x+y; return x;

}

int main() {

int x=2, y=5;

y=jumble(y,x);

x=jumble (y,x);printf("%d\n", x);

return 0;

}

The value printed by the program is____________.

12. Consider the following C program.

#include<stdio.h>

Int main() {

Int a [4] [5]={{1, 2, 3, 4, 5},

{6, 7, 8, 9, 10},

{11, 12, 13, 14, 15},

{16, 17, 18, 19, 20}};printf (“%d/n”, *(*{a+**a+2)+3));

Return (0);

}

The output of the program is

13. Consider the following C program:

#include <stdio.h>

int main() {

int arr[ ]={1,2,3,4,5,6,7,8,9,0,1,2,5), *ip=arr+4;

printf ("%d\n", ip[1]);

return 0;

The number that will be displayed on execution of the program is____________.

14.

Consider the following ANSI C function :

Int SomeFunction (int x, int y)

{

If (x--1) | | (y—1)) return 1;

If (x--y) return x;

If (x>y) return Some function(x-y, y);

}

The value returned by Some Function (15,255) is

15. Consider the following C functions.

Int fun1 (int n){

Static int i=0;

If{n>0) {

++i;

fun1(n-1);

}

return(i);

}

 

Int fun2 (int n){

Static int i=0;

If{n>0) {

i=i+fun1(n);

fun2(n-1);

}

return(i);

}

The return value of fun2(5) is

16. Consider the following ANSI C function :

Int Simple Function(int Y[], int n, int x)

{

Int total=Y(0), loopIndex;

For (loopIndex=1; loopIndex<=n-1; loopIndex++)

Total=x* total+Y(loopIndex}:

Return total;

}

Let Z be an array of 10 elements with Z[i]=1, for all I such that 0< I < 9. The value returned by Simple Function (Z, 10, 2) is

17. Consider the following C functions.

Int tob(int b, int* arr)[

Int I;

For (i=0; b>0; i++){

If (b%2) arr[i]=1;

Elese arr[i]=0;

B=b/2;

}

 

Int pp(int a, int b) {

Int arr[20];

Int I, tot=1, ex, len;

Ex=a;

Len=tob(b,arr);

For {i=0; i<len; i++}{

If(arr[i]==1)

tot =tot * ex;

ex = ex * ex;

}

Return (tot);

}

The Value returned by pp (3,4) is

18. Consider the following ANSI C program.
#include <stdio.h>
int foo(int x, int y, int q)
if ((x<=0) && (y<=0))
return q;
if (x<=0)
return foo (x, y-q, q);
if (y<=0)
return foo (x-q, y, q);
return foo (x, y-q, q) + foo(x-q, y, q);
}
int main()
{
Int r=foo(15, 15, 10);
printf(“%d”, r);
return 0;
}
The output of the program upon execution is

19.

Consider the following C program:

#include <stdio.h>

int main () {

float sum = 0.0, j = 1.0, i = 2.0;

while (ilj > 0.0625) {

j = j + j;

sum = sum + i/j;

printf ("%f\n", sum);

}

return 0;

}

The number of times the variable sum will be printed, when the above program is executed, is __________.

20. Consider the following C program:

#include <stdio.h>

int main ()

{

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

int i, sum = 0, *b = a + 4;

for (i = 0; i < 5; i++)

sum = sum + (*b - i) – *(b - i);

printf ("%d\n", sum);

return 0;

}

The output of the above C program is_______.