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Brain bench questions
Posted Date: 23 Mar 2008 Resource Type: Articles/Knowledge Sharing Category: Placement Papers
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Posted By: Logeshwaran Member Level: Gold
Rating:  Points: 5
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1.Sample Code
int x = 011 | 0x10;
What value will x contain in the sample code above?
Choice 1
3
Choice 2
13
Choice 3
19
Choice 4
25
Choice 5
27
2.Source Files
/* print.c */
#include
Void print()
{
printf( "World\n" );
}
/* main.c */
#include
static void print()
{
printf( "Hello\n" );
}
int main()
{
print();
return 0;
}
Referring to the program given by the 2 source files defined in the
code above, what will happen when you try to build and run the
program?
Choice 1
It will print:
Hello
World
Choice 2
It will not compile.
Choice 3
It will not link.
Choice 4
It will print Hello
Choice 5
It will print World
3.Code
int x = 3;
if( x == 2 ); x = 0;
if( x == 3 ) x++;
else x += 2;
What value will x contain when the sample code above is executed?
Choice 1
1
Choice 2
2
Choice 3
3
Choice 4
4
Choice 5
5
4. Code
void getFileLength( char *s )
{
FILE *f;
if( f = fopen( s, "r" ) )
{
fseek( f, SEEK_END, 0 );
printf( "%d\n", ????? );
fclose( f );
}
}
Which of the following could replace the ????? in the code above to
cause the function to print the length of the file when a valid file
name is passed to it?
Choice 1
filelen( f )
Choice 2
position( f )
Choice 3
ftell( f )
Choice 4
tell( f )
Choice 5
fposition( f ) Code
void getFileLength( char *s )
{
FILE *f;
if( f = fopen( s, "r" ) )
{
fseek( f, SEEK_END, 0 );
printf( "%d\n", ????? );
fclose( f );
}
}
Which of the following could replace the ????? in the code above to
cause the function to print the length of the file when a valid file
name is passed to it?
Choice 1
filelen( f )
Choice 2
position( f )
Choice 3
ftell( f )
Choice 4
tell( f )
Choice 5
fposition( f )
5. Which of the following is valid for opening a read-only ASCII
file?
Choice 1
fopen (filenm, "read");
Choice 2
fileOpen (filenm, "ra");
Choice 3
fileOpen (filenm, "r");
Choice 4
fopen (filenm, "r");
Choice 5
fileOpen (filenm, "read");
6. What is the maximum value of a signed data type that is 8 bits in
size?
Choice 1
2 to the power of 7
Choice 2
(2 to the power of 8) minus 1
Choice 3
2 to the power of 8
Choice 4
(2 to the power of 7) minus 1
Choice 5
2 to the power of 16
7. Code
int x = 10;
int *xPtr0, *xPtr1, *xPtr2, *xPtr3;
xPtr0 = &x;
xPtr1 = xPtr0;
xPtr2 = xPtr1;
xPtr3 = xPtr2;
Referring to the sample code above, which of the following print
statements would correctly print out the value of x?
Choice 1
printf("xPtr0=%d\n", xPtr3);
Choice 2
printf("xPtr0=%d\n", ***xPtr3);
Choice 3
printf("xPtr0=%d\n", ****xPtr3);
Choice 4
printf("xPtr0=%d\n", *xPtr3);
Choice 5
printf("xPtr0=%d\n", **xPtr3);
8. Code
f = fopen( filename, "r" );
Referring to the code above, what is the proper definition for the
variable f?
Choice 1
int f;
Choice 2
struct FILE f;
Choice 3
FILE f;
Choice 4
char *f;
Choice 5
FILE *f;
9. Code
char ptr1[] = "Hello World";
char *ptr2 = malloc( 5 );
ptr2 = ptr1;
What is wrong with the above code (assuming the call to malloc does
not fail)?
Choice 1
It will not compile.
Choice 2
There will be a memory leak.
Choice 3
Not enough space is allocated by the malloc.
Choice 4
There will be a segmentation fault.
Choice 5
There will be a memory overwrite.
10. Which of the following will give a hint to the compiler that might better optimize a frequently used local variable?
Choice 1
Declaring it as static
Choice 2
Declaring it as volatile
Choice 3
Declaring it as extern
Choice 4
Declaring it as register
Choice 5
Declaring it as auto
11. Code
int x = 5;
int y = 2;
char op = '*';
switch (op)
{
default : x += 1;
case '+' : x += y;
case '-' : x -= y;
}
After the sample code above has been executed, what value will the
variable "x" contain?
Choice 1
4
Choice 2
5
Choice 3
6
Choice 4
7
Choice 5
8
12. Which of the following characters will cause a printer to perform
a form feed?
Choice 1
'\b'
Choice 2
'\f'
Choice 3
'\n'
Choice 4
'\r'
Choice 5
'\s'
13. Code
int x = 0;
for ( ; ; )
{
if (x++ == 4) break;
continue;
}
printf("x=%d\n", x);
What will be printed when the sample code above is executed?
Choice 1
x=0
Choice 2
x=1
Choice 3
x=4
Choice 4
x=5
Choice 5
x=6
14. Sample Code
long factorial (long x)
{
????
return x * factorial(x - 1);
}
What would you replace the ???? with to make the function shown
above return the correct answer?
Choice 1
if (x >= 2) return 2;
Choice 2
if (x == 0) return 1;
Choice 3
return 1;
Choice 4
if (x <= 1) return 1;
Choice 5
if (x == 0) return 0;
15. What is a variable DECLARATION (as opposed to definition)?
Choice 1
The assignment of storage space to a variable whose properties have
been specified external to the current file scope.
Choice 2
The assignment of properties to a variable
Choice 3
The assignment of properties and storage space to a variable
Choice 4
The assignment of properties and identification to a variable
Choice 5
The assignment of storage space to a variable
16. Sample Code
const int n = 5;
int i, array[ n ];
for (i = 0; i < n; i++)
{
array[ i ] = i;
}
What will happen when the sample code fragment above is executed?
Choice 1
The code will compile, but not link.
Choice 2
The code may have problems at run time.
Choice 3
The code will not compile.
Choice 4
The code will compile with warnings.
Choice 5
The array will be initialized with the numbers 0 through 4.
17. Code
char *x;
x = "DATA";
Is the above code valid?
Choice 1
No. It would assign the string "DATA" to an unallocated space in
memory.
Choice 2
Yes. Upon initialization, the string "DATA" will be stored in a
special pointer memory address space.
Choice 3
No. This syntax is not allowed.
Choice 4
Yes. The pointer x will point to the memory location created for the
constant "DATA".
Choice 5
Yes. A new memory space will be allocated to hold the string "DATA".
18. Code
int i;
int *ptr;
for (i = 1; i<5; i++)
{ ptr = (int *) calloc(i, sizeof(int)); }
How will the sample code above behave when executed?
Choice 1
It will result in a memory over-write.
Choice 2
It will result in a run-time error since the pointer "ptr" is
undefined.
Choice 3
It will allocate 4 pointers of different sizes for later use.
Choice 4
It will allocate 3 pointers of different sizes for later use.
Choice 5
It will result in a memory leak.
19. Code
int i,j;
int ctr = 0;
int myArray[4][4];
for (i=0; i<4; i++)
for (j=0; j<4; j++)
{
myArray[i][j] = ctr;
++ctr;
}
What is the value of myArray[2][3]; in the sample code above?
Choice 1
6
Choice 2
7
Choice 3
9
Choice 4
11
Choice 5
14
20. How is time defined by the POSIX standard?
Choice 1
Time = number of seconds since GMT, 1/1/1900
Choice 2
Time = number of seconds since GMT, 1/1/1940
Choice 3
Time = number of seconds since GMT, 1/1/1950
Choice 4
Time = number of seconds since GMT, 1/1/1960
Choice 5
Time = number of seconds since GMT, 1/1/1970
21. US Coins
penny = one
nickel = five
dime = ten
quarter = twenty-five
How would enum be used to define the values of the American coins
listed above?
Choice 1
enum coin ({penny,1}, {nickel,5}, {dime,10}, {quarter,25});
Choice 2
enum coin (penny=1, nickel=5, dime=10, quarter=25);
Choice 3
enum coin {penny=1, nickel=5, dime=10, quarter=25};
Choice 4
enum coin {penny, nickel, dime, quarter} (1, 5, 10, 25);
Choice 5
enum coin {(penny,1), (nickel,5), (dime,10), (quarter,25)};
22. What header file is required for standard C library mathematical
functions?
Choice 1
stdlib.h
Choice 2
math.h
Choice 3
mathematical.h
Choice 4
stdmath.h
Choice 5
mathfunc.h
23.
Code
#include
int i;
void increment( int i )
{
i++;
}
int main()
{
for( i = 0; i < 10; increment( i ) )
{
}
printf("i=%d\n", i);
return 0;
}
What will happen when the program above is compiled and executed?
Choice 1
It will not compile.
Choice 2
It print out: i=9
Choice 3
It print out: i=10
Choice 4
It print out: i=11
Choice 5
It will loop indefinitely
24. Code
int *ptr = malloc(5 * sizeof(int));
realloc(ptr, 5 * sizeof(int));
for (i=0; i< 10; i++) { ptr[i] = 0; }
Assuming realloc succeeds, what effect will the above sample code
have on the rest of the program?
Choice 1
The pointer "ptr" will contain an array of 10 that is initialized to
0 with no issues.
Choice 2
This will result in a memory overwrite but no memory leak.
Choice 3
This will result in a memory leak but no memory overwrite.
Choice 4
This will result in both a memory leak and memory overwrite.
Choice 5
All but the last in the array of 10 integers will be initialized to
0.
25. Sample Code
void output (int x)
{
if (x != 0) {
output(x / 16);
putchar("0123456789ABCDEF"[x % 16]);
}
else
putchar('\n');
}
What will be output if the above function is called with x = 1234?
Choice 1
1234
Choice 2
2322
Choice 3
4321
Choice 4
4D2
Choice 5
It will not compile.
26. Code
#define MAX_NUM 15
Referring to the sample above, what is MAX_NUM?
Choice 1
MAX_NUM is a precompiler constant.
Choice 2
MAX_NUM is a preprocessor macro.
Choice 3
MAX_NUM is an integer constant.
Choice 4
MAX_NUM is an integer variable.
Choice 5
MAX_NUM is a linker constant.
27. Which of the following will turn off buffering for stdout?
Choice 1
setbuf( stdout, _IONBF );
Choice 2
setvbuf( stdout, NULL );
Choice 3
setvbuf( stdout, _IONBF );
Choice 4
setbuf( stdout, FALSE );
Choice 5
setbuf( stdout, NULL );
28. Code
char buf[5] = "a";
const char *ptr = buf;
Given the above, which of the following statements is legal?
Choice 1
ptr = buf;
Choice 2
*ptr = "a";
Choice 3
*ptr = buf;
Choice 4
ptr = 'a';
Choice 5
None of the above
29. Code
int z = 0;
int y;
for( y=1; y++ < 8; )
z += y;
printf("z=%d\n", z);
What will be printed when the sample code above is executed?
Choice 1
z=8
Choice 2
z=9
Choice 3
z=27
Choice 4
z=28
Choice 5
z=35
30.
Code
int counter = 0;
int aMatrix[5][5];
register int *aPtr;
int i, j;
for (i=0; i<5; i++)
for (j=0; j<5; j++) aMatrix[i][j] = counter++;
aPtr = &aMatrix[1][1];
printf("%d\n", aPtr[2]);
Referring to the sample code above, what will be the value of
"aPtr[2]", after execution?
Choice 1
5
Choice 2
6
Choice 3
7
Choice 4
8
Choice 5
9
31. What is a variable DEFINITION (as opposed to a declaration)?
Choice 1
The identification of a variable that resides elsewhere in the
program
Choice 2
The assignment of storage space to a variable
Choice 3
The assignment of properties to a variable
Choice 4
The assignment of storage space to a variable whose properties have
been specified external to the current file scope.
Choice 5
The assignment of properties and storage space to a variable
32. Statements
A) A definition allocates storage for the variable.
B) A declaration allocates storage for the variable.
C) A definition can occur muliple times
D) A declaration can occur multiple times
Regarding the difference between a declaration and a definition of
a variable, which of the above stataments are true?
Choice 1
A and C only
Choice 2
A and D only
Choice 3
B and C only
Choice 4
B and D only
Choice 5
none of the above
33. Which of the following statements allocates enough space to hold
an array of 10 integers which are initialized to 0?
Choice 1
int *ptr = (int *) alloc(10*sizeof(int));
Choice 2
int *ptr = (int *) calloc(10*sizeof(int));
Choice 3
int *ptr = (int *) malloc(10, sizeof(int));
Choice 4
int *ptr = (int *) calloc(10, sizeof(int));
Choice 5
int *ptr = (int *) malloc(10*sizeof(int));
34. Code
char buf1[100] = "Hello";
char buf2[100] = "World";
char *strptr1 = buf1 + 2;
char *strptr2 = buf2 + 3;
strcpy( strptr1, buf2 );
strcpy( strptr2, buf1 );
printf( "%s\n",buf1 );
printf( "%s\n",buf2 );
Given the sample code above, which of the following string values
will be printed when the code is executed?
Choice 1
HelWoHello
WoHello
Choice 2
HeWorHello
WorHello
Choice 3
HeWorld
WorHeWorld
Choice 4
HelWorld
WoHelWorld
Choice 5
HeWorld
WorHello
35. Code
char helloWorld[12];
char hello[6] = "Hello";
char world[7] = "-World";
Using the definitions above, how can the string "Hello-World" be
placed into helloWorld?
Choice 1
That would not be legal because helloWorld is not declared large
enough to hold the string "Hello-World"
Choice 2
helloWorld = hello + world;
Choice 3
strcpy( helloWorld, hello + world );
Choice 4
strcpy( helloWorld, hello );
strcat( helloWorld, world );
Choice 5
strcat( hello, world );
strcpy( helloWorld, hello );
36. Source File
#include
int main()
{
print( x++ );
}
int x = 5;
void print( int x )
{
printf( "%d\n", --x );
}
Referring to the source code file shown above, what will be printed
when the code is executed?
Choice 1
4
Choice 2
5
Choice 3
6
Choice 4
That file will not compile.
Choice 5
That file will compile, but not link
37. What file I/O function is used to report the number of bytes from
the beginning of the file to the file position indicator?
Choice 1
freport
Choice 2
fposind
Choice 3
fseek
Choice 4
ftell
Choice 5
Fcount
38. Code
char y = 'A';
char *ptr_y;
Referring to the sample code above, how would ptr_y be assigned to
point to y?
Choice 1
*ptr_y = &y;
Choice 2
*ptr_y = y;
Choice 3
(char *) *ptr_y = y;
Choice 4
ptr_y = (char *)y;
Choice 5
ptr_y = &y;
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