C examn

Question 11 pts

What does the following code print: unsigned int x = -1; int y = !-0; if (x == y) printf("same"); else printf("not same");

same.

not same.

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Question 21 pts

Which of the following is not a valid declaration in C? 1. short int x; 2. signed short x; 3. short x; 4. unsigned short x;

3 and 4

2

1

All of the above.

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Question 31 pts

What does the following lines of code print: int const a = 5; a++; printf(%d,a);

compiler error: increment of read-only variable 'a'

Linker error: increment of read-only variable 'a'

6

5

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Question 41 pts

Choose the correct option for the following program: int *p, **q; printf("%u ", sizeof(p)); printf("%u ", sizeof(q));

Both the printf() will print the same value.

First printf() prints the value less than the second.

Second printf() prints the value less than the first.

Error in the code.

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Question 51 pts

Which of the following can be included in a variavble name?

* (asterisk)

# (Hash)

+ (Addition)

_ (underscore)

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Question 61 pts

Which of the options are correct for the following code? char a = 'a'; // line 1 char b = b; // line 2 char c = '1'; // line 3 int d = 1; // line 4

Code at line 2 fails to compile.

Code at line 3 fails to compile.

Code at line 4 fails to compile.

Code at line 1 fails to compile.

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Question 71 pts

What is the output of a program with the following lines of code?

char s[] = "Fine"; *s = 'N'; printf("%s", s);

Fine

Nine

Compile error

Runtime error

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Question 81 pts

Which of the following operator can be used to access value at address stored in a pointer variable?

*

#

&&

@

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Question 91 pts

Which option is correct for calling the following function from another function?

int function(int *a, int *b) { int temp = (*a)+(*b); *a = 3*temp - (2*(*b))%9; *b = (*a)%temp; printf("a = %d, b = %d ", *a, *b); return (*a) - (*b); }

int a = 2, b = 1; b = function([]a, []b);

int a = 2, b = 1; b = function(*a, *b);

int a = 2, b = 1; b = function(a, b);

int a = 2, b = 1; b = function(&a, &b);

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Question 101 pts

Which option is correct for calling the following function from another function?

void function(int array[], int length) { int i; int temp[length]; for (i=0; i

int values[] = {3, 0, 4, 5, 1, 2}; function(values, 6);

int values[] = {3, 0, 4, 5, 1, 2}; function(values[], 6);

int values[] = {3, 0, 4, 5, 1, 2}; function(*values, 6);

int values[] = {3, 0, 4, 5, 1, 2}; function(values[0], 6);

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Question 111 pts

extern int fun(); - The declaration indicates the presence of a global function defined outside the current module or in another file.

True

False

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Question 121 pts

In this code segment, which line causes an array index "out of bounds" first?

int nums[10], i; // line 1 for (i=1; i<10; i++) // line 2 nums[i-1] = 2*i+5; // line 3 i = 0; // line 4 while (i < 10) { // line 5 int t = nums[i+1]; // line 6 nums[i] = nums[t]; // line 7 i++; // line 8 }

line 1

line 3

line 5

line 7

None of the above.

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Question 131 pts

Which of the following correctly opens the file "num.txt" to read from?

FILE* ifp = fopen("num.txt", "r");

FILE* ifp = fopen("num.txt");

FILE* ifp = fopen(num.txt, r);

FILE* ifp = fopen("num.txt", r);

None of the above.

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Question 141 pts

What is the output of the following lines of code when fun2 is called from a main() function in a c program?

line 1: void fun1(int *a) line 2: { line 3: a = (int*)malloc(sizeof(int)); line 4: } line 5: int fun2() line 6: { line 7: int *p; line 8: fun1(p); line 9: *p = 6; line 10: printf("%d ",*p); line 11: return(0); line 12: }

Compile error

Runtime error

6

*p

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Question 151 pts

What does the following function do?

1. void f(int array[], int length) { 2. int i; 3. int temp = array[0]; 4. for (i=0; i

sorts the values in the array

copies the first value into each array element

does a left circular shift on the items in the array

does a right circular shift on the items in the array

None of the Above.

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Question 161 pts

Given the function x below, what is the value of the expression: x(x(1,2), x(4,3))

1. int x(int a, int b) { 2. if (a < b) 3. return a + b; 4. return a*b; 5. }

10

15

21

24

None of the above.

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Question 171 pts

Which of the following reads in one integer from the file pointed to by ifp into the variable num?

scanf("%d", &num);

fscanf("%d", &num);

fscanf(ifp, &num);

fscanf(ifp, "%d", &num);

None of the above.

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Question 181 pts

What restriction on the contents of array guarantees that accessing any elements of array will not cause an array out of bounds error, assume that length is the length of the array?

All values will be in between 1 and 6, inclusive.

All values will be in between 0 and length-1, inclusive.

All values will be in between 1 and length, inclusive.

All values will be in between 0 and length, inclusive.

None of the above.

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Question 191 pts

Which of the below three functions are likely to cause problems with pointers?

1. [PI] int * g (void) 2. { 3. int x= 10; 4. return (&x); 5. } 1. [P2] int * g (void) 2. { 3. int * px; 4. *px= 10; 5. return px; 6. } 1. [P3] int *g (void) 2. { 3. int *px; 4. px = (int *) malloc (sizeof(int)); 5. *px= 10; 6. return px; 7. }

Only P3

Only P1 and P3

Only P1 and P2

P1, P2 and P3

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Question 201 pts

Which of the following is/are true?

calloc() allocates the memory and also initializes the allocates memory to zero, while memory allocated using malloc() has random data.

malloc() and memset() can be used to get the same effect as calloc().

calloc() takes two arguments, but malloc takes only 1 argument.

Both malloc() and calloc() return 'void *' pointer.

All of the above.

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Question 211 pts

What is the return type of malloc() or calloc() ?

void *

Pointer of allocated memory type

void **

int *

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Question 221 pts

What is the problem with following code?

int *p = (int *)malloc(sizeof(int)); p = NULL; free(p);

Compiler Error: free can't be applied on NULL pointer

Memory Leak

Dangling Pointer

The program may crash as free() is called for NULL pointer

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Question 231 pts

Assume that base address of arr is 2000 and size of integer is 32 bit. What is the output of the followinf program?

int arr[5]; arr++; printf("%u", arr);

2002

2004

2020

Not possible to apply addition.

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Question 241 pts

What will the following code print?

1. int i; 2. int arr[5] = {1}; 3. for (i = 0; i < 5; i++) 4. printf("%d ", arr[i]);

1 followed by four garbage values

1 0 0 0 0

1 1 1 1 1

0 0 0 0 0

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Question 251 pts

Which of the following statements creates a multidimensional array with 3 rows, where the first row contains 1 element, the second row contains 4 elements and the final row contains 2 elements?

int[][] items = {{1, null, null, null}, {2, 3, 4, 5}, {6, 7, null, null}};

int[][] items = {{1}, {2, 3, 4, 5}, {6, 7}};

int[][] items = {{1}, {2, 3, 4, 5}, {6, 7}, {});

int[][] items = {{1}, {4}, {2}};

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Question 261 pts

Which of the following statements are correct about the following function? long fun(int num) { int i; long f=1; for(i=1; i<=num; i++) f = f * i; return f; }

The function calculates the value of 1 raised to power num.

The function calculates the square root of an integer.

The function calculates the factorial value of an integer

None of the above.

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Question 271 pts

C library function __________ is used for comparing arrays of characters to determine whether they are equal and have the same contents.

strcmp

strcp

strequal

equals

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Question 281 pts

When fopen() is not able to open a file, it returns

EOF

NULL

Runtime Error

Compiler Dependent

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Question 291 pts

In fopen(), the open mode "wx" is sometimes preferred "w" because.

1) Use of wx is more efficient. 2) If w is used, old contents of file are erased and a new empty file is created. When wx is used, fopen() returns NULL if file already exists.

Only 1

Only 2

Both 1 and 2

Neither 1 and 2

Neither 1 nor 2

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Question 301 pts

Which of the following is not a storage class specifier in C?

auto

register

static

extern

typedef

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Question 311 pts

Information is passed to a function in ________.

the function name

that function's return

the function body

the prameter to the method

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Question 321 pts

The parameters in the function declaration and the arguments in the function call must agree in:

number

type

order

All of the above.

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Question 331 pts

What is the output of the following problem ?

1. int main() 2. { 3. func(1); 4. return 0; 5. }

6. func(int i){ 7. static char *str[] = {"One","Two", "Three", "Four"}; 8. printf("%s ",str[i++]); 9. return; 10. }

One

Two

Three

wo

Segmentation fault

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Question 341 pts

What is the output of the following C Program?

int main() { static char names[5][20]={"Orlando","Atlanta","Austin","New York","Los Angeles"}; int i; char *t; t=names[3]; names[3]=names[4]; names[4]=t; for (i=0;i<=4;i++) printf("%s",names[i]); return 0; }

Orlando Atlanta Austin New York Los Angeles

Orlando Atlanta Austin

Compiler error

None of the above

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Question 351 pts

The expression ((fpt = fopen ("Samples", "w")) == NULL) would be true if

the file sample does not exist while fopen is being executed

the file "sample" could not be created for writing

fpt is not declared as a FILE pointer

the file "sample" is read only

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Question 361 pts

x = fopen (b, c) what is b?

A. pointer to a character array which contains the filename

B. filename within double quotes

C. Can be A and B above

D. None of the above

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Question 371 pts

float x, y, z; scanf ("%f %f", &x, &y);

If input stream contains "4.2 3 2.3 ..." What will x and y contain after scanf?

4.2, 3.0

4.2, 2.3

4.2 2.0

None of the above

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Question 381 pts

What is the output of the following 'C' function when called?

1. void function() { 2. int x = 10,y = 10, z = 5, i; 3. i = x; 4. printf("%d",i==x); 5. }

1

Error

0

5

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Question 391 pts

In a C program, if the initialization statement is:

int x,y=2,z,a;

What would be the value of x when the following line of code is executed?

x = (y*=2) + (z=a=y);

7

8

6

syntactically wrong

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Question 401 pts

Given the struct xx with the following members:

int x=3; char name[]="hello";

What would be the output of the following program?

1. void main() 2. { 3. struct xx *s=malloc(sizeof(struct xx)); 4. printf("%d",s->x); 5. printf("%s",s->name); 6. }

3 hello

Garbage value hello

3 Garbage Value

Compiler error

None of the abo