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Programming (C/C++)

Description: Test your C skill in programming language for mca entrance and campus placements by free online preparation and practice paper tests
Number of Questions: 25
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Tags: C Skills Test Java Skill Test DBMS Oracle PHP Computer Application Placement Papers MCA Entrance Programming Fundamentals of Computer Programming
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With every use of a memory allocation function, what function should be used to release allocated memory which is no longer needed?

  1. unalloc()

  2. dropmem()

  3. dealloc()

  4. release()

  5. free()


Correct Option: E

int z,x=5,y=-10,a=4,b=2; z = x++ - --y * b / a; What will be the value of z in the sample code given above?

  1. 5

  2. 6

  3. 10

  4. 11

  5. 12


Correct Option: C

void *ptr; myStruct myArray[10]; ptr = myArray; Which of the following is the correct way to increment the variable "ptr"?

  1. ptr = ptr + sizeof(myStruct);

  2. ++(int*)ptr;

  3. ptr = ptr + sizeof(myArray);

  4. increment(ptr);

  5. ptr = ptr + sizeof(ptr);


Correct Option: A

char* myFunc (char *ptr) { ptr += 3; return (ptr); } int main() { char *x, *y; x = HELLO; y = myFunc (x); printf (y = %s n, y); return 0;
} What will be the output when the sample code given above is executed?

  1. y = HELLO

  2. y = ELLO

  3. y = LLO

  4. y = LO

  5. y = O


Correct Option: D

What is the difference between declaration and definition of a variable?

  1. Both can occur multiple times, but a declaration must occur first.

  2. There is no difference between them.

  3. A definition occurs once, but a declaration may occur many times.

  4. A declaration occurs once, but a definition may occur many times.

  5. Both can occur multiple times, but a definition must occur first.


Correct Option: C

int testarray[3][2][2] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}; What value does testarray[2][1][0] in the sample code above contain?

  1. 3

  2. 5

  3. 7

  4. 9

  5. 11


Correct Option: E

int a=10,b; b=a++ + ++a; printf(%d,%d,%d,%d,b,a++,a,++a); What will be the output when following code is executed?

  1. 12,10,11,13

  2. 22,10,11,13

  3. 22,11,11,11

  4. 12,11,11,11

  5. 22,13,13,13


Correct Option: E

11 ^ 5 What is the output of the above operation?

  1. 1

  2. 6

  3. 8

  4. 14

  5. 15


Correct Option: D

Which function will read a specified number of elements from a file?

  1. fileread()

  2. getline()

  3. readfile()

  4. fread()

  5. gets()


Correct Option: B

"My salary was increased by 15%!" Select the statement which will EXACTLY reproduce the line of text above.

  1. printf(""My salary was increased by 15/%!"n");

  2. printf("My salary was increased by 15%!n");

  3. printf("My salary was increased by 15'%'!n");

  4. printf(""My salary was increased by 15%%!"n");

  5. printf(""My salary was increased by 15'%'!"n");


Correct Option: D

struct node nPtr, *sPtr; / pointers for a linked list. */ for (nPtr=sPtr; nPtr; nPtr=nPtr->next) { free(nPtr); } The sample code above releases memory from a linked list. Which of the choices below accurately describes how it will work?

  1. It will work correctly since the for loop covers the entire list.

  2. It may fail since each node nPtr is freed before its next address can be accessed.

  3. In the for loop, the assignment nPtr=nPtr->next should be changed to nPtr=nPtr.next.

  4. This is invalid syntax for freeing memory.

  5. The loop will never end.


Correct Option: B

void myFunc (int x) { if (x > 0) myFunc(--x); printf(%d, , x); } int main() { myFunc(5); return 0; } What will the output of the above code after execution?

  1. 1, 2, 3, 4, 5, 5

  2. 4, 3, 2, 1, 0, 0

  3. 5, 4, 3, 2, 1, 0

  4. 0, 0, 1, 2, 3, 4

  5. 0, 1, 2, 3, 4, 5


Correct Option: D

int x[] = { 1, 4, 8, 5, 1, 4 }; int *ptr, y; ptr = x + 4; y = ptr - x; What is the value of y in the sample code given above?

    • 3
  1. 0

  2. 4

  3. 4 + sizeof( int )

  4. 4 * sizeof( int)


Correct Option: C

#define MAX_NUM 15 Referring to the sample above, what is MAX_NUM?

  1. MAX_NUM is an integer variable.

  2. MAX_NUM is a linker constant.

  3. MAX_NUM is a precompiler constant.

  4. MAX_NUM is a preprocessor macro.

  5. MAX_NUM is an integer constant.


Correct Option: D

What is a proper method of opening a file for writing as a binary file?

  1. FILE *f = fwrite( test.bin, b );

  2. FILE *f = fopen ( test.bin, w );

  3. FILE *f = fopen( test.bin, wb );

  4. FILE *f = fwriteb( test.bin );

  5. FILE *f = fopen( test.bin, bw );


Correct Option: B

Which one of the following will turn off buffering for stdout?

  1. setbuf(stdout, FALSE);

  2. setvbuf(stdout, NULL);

  3. setbuf(stdout, NULL);

  4. setvbuf(stdout, _IONBF);

  5. setbuf(stdout, _IONBF);


Correct Option: C

Which of following functions is the correct choice for moving blocks of binary data which are having arbitrary size and position in memory?

  1. memcpy()

  2. memset()

  3. strncpy()

  4. strcpy()

  5. memmove()


Correct Option: D

int x = 2 * 3 + 4 * 5; What will be the value of x in the sample code?

  1. 22

  2. 26

  3. 46

  4. 50

  5. 70


Correct Option: B

time_t t; Which of the following statements will properly initialize the variable t with the current time from the sample above?

  1. t = clock();

  2. time( &t )

  3. t = ctime();

  4. t = localtime();

  5. None of the above


Correct Option: A

int var1; If a variable has been declared with file scope, as above, can it safely be accessed globally from another file?

  1. Yes; it can be referenced through the register specifier.

  2. No; it would need to have been initially declared as a static variable.

  3. No; it would need to have been initially declared using the global keyword.

  4. Yes; it can be referenced through the publish specifier.

  5. Yes; it can be referenced through the extern specifier.


Correct Option: C

Which kind of language is language C?

  1. Machine

  2. Procedural

  3. Assembly

  4. Object-oriented

  5. Strictly-typed


Correct Option: B

Which one of the following provides conceptual support for function calls?

  1. The system stack

  2. The data segment

  3. The processor's registers

  4. The text segment

  5. The heap


Correct Option: A

int x = 0; for (x=1; x<4; x++); printf(x=%dn, x); What will be the output of the sample code given above?

  1. x = 0

  2. x = 1

  3. x = 3

  4. x = 4

  5. x = 5


Correct Option: D

void * array_dup (a, number, size) const void * a; size_t number; size_t size; { void * clone; size_t bytes; assert(a != NULL); bytes = number * size; clone = alloca(bytes); if (!clone) return clone; memcpy(clone, a, bytes); return clone; }

The function array_dup(), defined above, contains an error. Which of the following options correctly analyses it?

  1. If the arguments to memcpy() refer to overlapping regions, the destination buffer will be subject to memory corruption.

  2. Array_dup() declares its first parameter to be a pointer, when the actual argument will be an array.

  3. The memory obtained from alloca() is not valid in the context of the caller. Moreover, alloca() is non-standard.

  4. Size_t is not a standard C defined type, and may not be kn.

  5. The definition of array_dup() is unusual. Functions cannot be defined using this syntax.


Correct Option: A
Explanation:

Option (1) is correct.

int i,j; int ctr = 0; int myArray[2][3]; for (i=0; i<3; i++) for (j=0; j<2; j++) { myArray[j][i] = ctr; ++ctr; } What is the value of myArray[1][2]; in the sample code?

  1. 1

  2. 2

  3. 3

  4. 4

  5. 5


Correct Option: E
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