C Programming Tricks, Test, Interview Questions

Structure Comparison

noreply@blogger.com (Vikram) — Tue, 11 May 2010 10:48:00 +0000

) int main()
{
struct emp
{
char name[20];
int empno;

};

struct emp e1 = {"harrypotter", 1311};

struct emp e2 = e1;

if (e1==e2)
printf ("e1 and e2 are same");
else
printf ("e1 and e2 are different");

}

Choice:
a)e1 and e2 are same
b)e1 and e2 are different
c)Error
d)Segmentation fault

What is the output of following program?

noreply@blogger.com (Vikram) — Mon, 15 Feb 2010 11:14:00 +0000

2) void squared(void *nbr)
{
*nbr *= *nbr;
}

int main()
{
int a = 2;
squared((void *)a);
return 0;
}

Choice:
a)Error
b)4
c)4 with warning
d)2
e)Segmentation Fault

C Preprocessor Question

noreply@blogger.com (Vikram) — Mon, 15 Feb 2010 11:10:00 +0000

#define PRINT printout

int main()
{
printf("PRINT");
}

Choice:
a)error
b)PRINT
c)printout
d)no output

What does the operation shown below produce?

noreply@blogger.com (Vikram) — Wed, 10 Feb 2010 08:35:00 +0000

11 ^ 5

a) 1
b) 6
c) 8
d) 14
e) 15

Which of the following is the correct way to increment the variable "ptr"?

noreply@blogger.com (Vikram) — Wed, 10 Feb 2010 08:33:00 +0000

a) ptr = ptr + sizeof(myStruct); [Ans]
b) ++(int*)ptr;
c) ptr = ptr + sizeof(myArray);
d) increment(ptr);
e) ptr = ptr + sizeof(ptr);

What number will z in the sample code contain?

noreply@blogger.com (Vikram) — Wed, 10 Feb 2010 08:25:00 +0000

int z,x=5,y=-10,a=4,b=2;
z = x++ - --y * b / a;

a) 5
b) 6
c) 10
d) 11
e) 12

Understanding Stack and Queue

noreply@blogger.com (Vikram) — Wed, 10 Feb 2010 08:22:00 +0000

The five items: A, B, C, D and E are pushed in a stack,one after the other starting from A. The stack is popped four times and each element is inserted in a queue. Then two elements are deleted from the queue and pushed back on the stack. Now one item is popped from the stack.
The popped item is

a) A
b) B
c) C
d) D

fputs function is used to ?

noreply@blogger.com (Vikram) — Wed, 10 Feb 2010 08:18:00 +0000

i. write characters to a file
ii. takes 2 parameters
iii. returns a character
iv. requires a file pointer

a) all are true
b) all are false
c) only i and ii are true
d) only i,ii and iv are true

What is the output of this program?

noreply@blogger.com (Vikram) — Wed, 10 Feb 2010 08:15:00 +0000

main()
{
struct
{
int i;
}xyz;
(*xyz)->i=10;
printf("%d",xyz.i);
}

a) program will not compile
b) 10
c) god only knows
d) address of i

What is the output of following programme ?

noreply@blogger.com (Vikram) — Mon, 08 Feb 2010 11:24:00 +0000

# include
# define a 10
main()
{
printf("%d..",a);
foo();
printf("%d",a);
}
void foo()
{
#undef a
#define a 50
}

a) 10..10
b) 10..50
c) Error
d) 0

What does the following program print?

noreply@blogger.com (Vikram) — Mon, 08 Feb 2010 11:12:00 +0000

int a[3][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};

main()
{
int i;
for(i = 0; i < 3; i++)
printf("%d%d%d", a[i][2-i], *a[i], *(*(a+i)+i));
}

a) 3 1 1
   5 4 5
   7 7 9
b) 7 1 1
   5 4 5
   3 7 9
c) 3 1 1
   5 4 7
   7 7 9
d) 3 5 7
   1 4 7
   1 7 9

The output of printf("%u", -1) is

noreply@blogger.com (Vikram) — Mon, 08 Feb 2010 11:01:00 +0000

a) -1
b) Minimum int value
c) Maximum int value
d) Error message

The printf() function retunes which value when an error occurs?

noreply@blogger.com (Vikram) — Mon, 08 Feb 2010 10:52:00 +0000

a) Positive value
b) Zero
c) Negative value
d) None of these

What does the following program print?

noreply@blogger.com (Vikram) — Sun, 10 Jan 2010 09:16:00 +0000

#include

void main()
{

static struct S1
{
char c[4], *s;
} s1 = {"abc", "def"};

printf("%c %c\n", s1.c[0], *s1.s);
printf("%s %s", s1.c, s1.s);
}

a) Compiler error

b) a def
   abc def

c) a d
   abc def

d) a d
   a def

What is the output of following program?

noreply@blogger.com (Vikram) — Sun, 10 Jan 2010 09:11:00 +0000

#include
int main()
{
printf("%c\n", '1' + 1);
return EXIT_SUCCESS;
}

a) ASCII value of '1' is required to find out the answer
b) 2
c) 50
d) Syntax Error

noreply@blogger.com (Vikram) — Sun, 10 Jan 2010 09:07:00 +0000

#include
void func()
{
int x = 0;
static int y = 0;
x++; y++;
printf( "%d -- %d\n", x, y );
}

int main()
{
func();
func();
return 0;
}

What will the code above print when it is executed?

a) 1 -- 1
1 -- 1
b) 1 -- 1
2 -- 1
c) 1 -- 1
2 -- 2
d) 1 -- 0
1 -- 0
e) 1 -- 1
1 -- 2

Which one of the following statements could replace the ???? in the code above to cause the string 1-2-3-10-5- to be printed when the code is executed?

noreply@blogger.com (Vikram) — Sun, 10 Jan 2010 09:03:00 +0000

int x[] = {1, 2, 3, 4, 5};
int u;
int *ptr = x;
????
for( u = 0; u < 5; u++ ) { printf("%d-", x[u]); } printf( "\n" ); a) *ptr + 3 = 10; b) *ptr[ 3 ] = 10; c) *(ptr + 3) = 10; d) (*ptr)[ 3 ] = 10; e) *(ptr[ 3 ]) = 10;

With what do you replace the ???? to make the function shown below return the correct answer?

noreply@blogger.com (Vikram) — Sun, 10 Jan 2010 09:01:00 +0000

long factorial (long x)
{
????
return x * factorial(x - 1);
}

a) if (x == 0) return 0;
b) return 1;
c) if (x >= 2) return 2;
d) if (x == 0) return 1;
e) if (x <= 1) return 1;

How many bytes are allocated by the definition below?

noreply@blogger.com (Vikram) — Sun, 10 Jan 2010 08:54:00 +0000

char txt [20] = "Hello world!\0";

a) 11 bytes
b) 12 bytes
c) 13 bytes
d) 20 bytes
e) 21 bytes

In terms of code generation, how do the two definitions of buf, both presented above, differ?

noreply@blogger.com (Vikram) — Sun, 10 Jan 2010 08:51:00 +0000

char buf [] = "Hello world!";
char * buf = "Hello world!";

a) The first definition certainly allows the contents of buf to be safely modified at runtime; the second definition does not
b) The first definition is not suitable for usage as an argument to a function call; the second definition is
c) The first definition is not legal because it does not indicate the size of the array to be allocated; the second definition is legal
d) They do not differ -- they are functionally equivalent
e) The first definition does not allocate enough space for a terminating NUL-character, nor does it append one; the second definition does

Which one of the following will declare a pointer to an integer at address 0x200 in memory?

noreply@blogger.com (Vikram) — Sun, 10 Jan 2010 08:45:00 +0000

a) int *x;
*x = 0x200;
b) int *x = &0x200;
c) int *x = *0x200;
d) int *x = 0x200;
e) int *x( &0x200 );

What string does ptr point to in the sample code below?

noreply@blogger.com (Vikram) — Sun, 10 Jan 2010 08:44:00 +0000

char *ptr;
char myString[] = "abcdefg";
ptr = myString;
ptr += 5;

a) fg
b) efg
c) defg
d) cdefg
e) None of the above

What value will x contain when the sample code below is executed?

noreply@blogger.com (Vikram) — Sun, 10 Jan 2010 08:39:00 +0000

int x = 3;
if( x == 2 );
x = 0;
if( x == 3 )
x++;
else x += 2;

a) 1
b) 2
c) 3
d) 4
e) 5

Ternary Operator

noreply@blogger.com (Vikram) — Tue, 15 Dec 2009 11:15:00 +0000

What is the output.

int main()
{
int i=10,j=20;
j = i, j?(i,j)?i:j:j;
printf("%d %d",i,j);
}
Choice:
a)10 10
b)20 20
c)10 11
d)11 10
e)10 20

What is the output of following programme ?

noreply@blogger.com (Vikram) — Mon, 08 Jun 2009 14:15:00 +0000

main()
{
int a=2,*f1,*f2;
f1=f2=&a;
*f2+=*f2+=a+=2.5;
*f1+=*f1+=a+=2.5;
printf("\n%d %d %d",a,*f1,*f2);
}

Choice
a) 18,18,18
b) 10,10,10
c) 72,72,72
d) 64,64,64
e) 26,26,26