Programming with C Test Answers
·
1. Which of the following statements
will result in a compilation error?
Answers:
• int n=5, x;
x=n++;
• int n=5, x; x= ++n++;
• int n=5, x; x= (n+1)++;
• int n=5, x=6; x= (n+x)++;
• None of the
above
2. Read the following two declaration
statements.
1. #include <stdio.h>
2. #include "stdio.h"
Which of the following statements pertaining
to the above two statements are correct?
Answers:
• For statement
1, the header file will be searched first in the local directory and then in
the standard system directories such as "/usr/include"
• For statement 1, the
header file will be searched in the standard system directories such as
"/usr/include"
• For statement 2, the
header file will be searched first in the local directory and then in the
standard system directories such as "/usr/include"
• For statement
2, the header file will be searched in the standard system directories such as
"/usr/include"
• None of the
above
3. Which of the following statements are
correct for the keyword register?
Answers:
• It is a
storage-class-specifier
• It guarantees
that the variable is kept in the CPU register for maximum speed
• It requests that the
variable be kept in the CPU register for maximum speed
• It does not guarantee that
the variable value is kept in CPU register for maximum speed
4. Which is/are the type/s of memory
allocation that needs/need the programmer to take care of memory management?
Answers:
• Static memory
allocation
• Dynamic memory allocation
• Automatic
memory allocation
• Memory allocation on stack
• Memory
allocation on heap
5. Which of the following comparison
statements will be true if an integer is 16 bits and a long is 32 bits on a
machine?
Answers:
• -1L < 1U
• -1L > 1U
• -1L < 1UL
• -1L > 1UL
6. Which of the following is the correct way
of initializing a two-dimensional array?
Answers:
• char
str[2][4]={ "abc", "def" };
• char
str[2][4]={ {"abc"}, {"def"} };
• char str[2][4]={
{'a','b','c','\0'}, {'d','e','f','\0'} };
• a and b
• a, b and c
7. Given the array:
int num[3][4]= {
{3,6,9,12},
{15,25,30,35},
{66,77,88,99}
};
what would be the output of *(*(num+1)+1)+1?
Answers:
• 3
• 15
• 26
• 66
• 77
8. Which function will you use to write a
formatted output to the file?
Answers:
• fputc()
• fputs()
• fprintf()
• fseek()
• ftell()
9. Given the array:
int num[3][4]=
{
{3,6,9,12},
{15,25,30,35},
{66,77,88,99}
};
what would be the output of *(*(num+1))?
Answers:
• 3
• 15
• 66
• 6
• 25
10. What would be printed on the standard
output as a result of the following code snippet?
main()
{
char option = 5;
switch(option)
{
case '5':
printf("case : 1 \n");
break;
case 5:
printf("case : 2 \n");
break;
default:
printf("case : 3 \n");
break;
}
return 0;
}
Answers:
• case : 1
• case : 2
• case : 3
• Result in
compilation error
• None of the
above
11. What would be printed on the standard
output as a result of the following code snippet?
main()
{
int
i=5;
char option = 5;
switch(option)
{
case '5':
printf("case : 1 \n");
break;
case i:
printf("case : 2 \n");
break;
default:
printf("case : 3 \n");
break;
}
return 0;
}
Answers:
• case : 1
• case : 2
• case : 3
• Result in compilation
error
• None of the
above
12. What would be printed on the standard
output as a result of the following code snippet?
#define func(t, a, b) { t temp; temp=a; a=b;
b=temp; }
main()
{
int
a=3, b=4;
float c=4.5, d = 5.99;
func(int, a, b);
func(float, c, d);
printf("%d %d ", a, b);
printf("%.2f %.2f\n", c, d);
}
Answers:
• Results in
Compilation Error
• 3 4 5.99 4.50
• 3 4 4.50 5.99
• 4 3 5.99 4.50
• None of the
above
13. What would be printed on the standard
output as a result of the following code snippet?
main()
{
void addup (int b);
addup(b);
return 0;
}
int b = 5;
void addup (int b)
{
static int v1;
v1
= v1+b;
printf("%d ", v1);
}
Answers:
• Will result in Compilation
Error
• 5
• 0
• Undefined value
14. Given the following array declaration:
int
a[2][3][4];
what would be the number of elements in array
a?
Answers:
• 24
• 22
• 20
• 12
• 36
15. Which file header is to be included for
file handling in a C program?
Answers:
• string.h
• file.h
• stdio.h
• stdlib.h
• ctype.h
16. What is the return type of the following
function declaration?
func(char c);
Answers:
• void
• char
• int
• undefined
17. What is the return value in case a file is
not opened successfully by using fopen()?
Answers:
• 0
• 1
• 100
• NULL
18. What is the function to concatenate two
strings?
Answers:
• strcmp()
• strcpy()
• strcat()
• strlen()
• catstr()
19. Which of the following statements is valid
and correct?
Answers:
• char amessage[] =
"lmnop"; amessage++;
• char *pmessage
= "abcde"; (*pmessage)++;
• char amessage[]
= "lmnop"; (*amessage)++;
• char *pmessage
= "abcde"; pmessage++;
20. What will be the output of following code?
int main()
{
int i;
i = 0;
for (i = 1; i
<2; i++)
{
i++;
printf( "%d", i );
continue;
printf( "%d", i );
}
return 0;
}
Answers:
• 22
• 2,2
• 2
• none of the
above
21. Which of the following is not a valid mode
for opening a file?
Answers:
• r
• w
• a
• r+
• i
22. Given the following array:
char books[][40]={
"The Little World of Don Camillo",
"To Kill a Mockingbird",
"My Family and Other Animals",
"Birds, Beasts and Relatives"
};
what would be the output of
printf("%c",books[2][5]);?
Answers:
• m
• M
• F
• i
• L
23. What would be printed on the standard
output as a result of the following code snippet?
char *str1 = "Hello World";
strcat(str1, '!');
printf("%s", str1);
Answers:
• Hello World!
• Hello World
• Hello
• The code snippet will
throw a compilation error
24. What will be printed on the standard
output as a result of the following code snippet?
void main()
{
char arr[] = {'R','A','M','\0'};
printf("%d",strlen(arr));
}
Answers:
• 0
• 1
• 3
• 4
• Cannot be
determined
25. Given the following array:
int a[8] = {1,2,3,4,5,6,7,0};
what would be the output of
printf("%d",a[4]); ?
Answers:
• 3
• 4
• 5
• 6
• 7
26. In order to read structures/records from a
file, which function will you use?
Answers:
• fscanf()
• fread()
• fgets()
• fgetc()
• fseek
27. An array is defined with the following
statement in a file, file1.c
int
a[ ] = { 1, 2, 3, 4, 5, 6 };
In another file, file2.c, the following code
snippet is written to use the array a:
extern int a[];
int size = sizeof(a);
What is wrong with the above code snippet?
Answers:
• The size of the
operator cannot be applied to an array
• There is
nothing wrong with the code snippet. The value of the size will be 6
• There is
nothing wrong with the code snippet. The value of the size will be 7
• An extern array of
unspecified size is an incomplete type. The size of the operator during compile
time is unable to learn the size of an array that is defined in another file
• None of the
above
28. What would be printed on the standard
output as a result of the following code snippet?
main()
{
char *s="Hello World";
char s1[20], s2[20];
int
len = sscanf(s,"%s",s1);
printf("%s : %d", s1, len);
}
Answers:
• Compilation
Error
• Hello World :
11
• Hello World : 1
• Hello : 5
• Hello : 1
29. Suppose there is a file a.dat which has to
be opened in the read mode using the FILE pointer ptr1, what will be the
correct syntax?
Answers:
• ptr1 =
open("a.dat");
• ptr1 =
fileopen("a.dat");
• ptr1 =
fopen("a.dat","r");
• ptr1 =
open("a.dat","r");
• ptr1 =
fileopen("a.dat","r");
30. Given the following array:
char books[][40]={
"The Little World of Don Camillo",
"To Kill a Mockingbird",
"My Family and Other Animals",
"Birds, Beasts and Relatives"
};
what would be the output of
printf("%s",books[3]);?
Answers:
• Birds
• B
• Birds, Beasts and
Relatives
• My Family and
Other Animals
• M
31. What would be printed on the standard
output as a result of the following code snippet?
void main()
{
unsigned char a=25;
a = ~a;
signed char b = 25;
b = ~b;
printf("%d %d ",
a, b);
}
Answers:
• 0 0
• 230 230
• 230 -26
• 230 -103
• None of the
above
32. Which function will convert a string into
a double precision quantity?
Answers:
• atoi()
• atof()
• atol()
• atan()
• acos()
33. Which of the following is not a type of
operator ?
Answers:
• Rational
• Unary
• Ternary
• Compound
assignment
• Logical
34. The declaration int *(*p)[10] indicates:
Answers:
• p is an array
of pointers to functions the return type of which is an integer
• p is a pointer
to a function that returns a pointer to an integer
• p is a pointer to an array
of integer pointers
• p is a pointer
to a character string
35. What will be printed on the standard
output as a result of the following code snippet?
void main()
{
int
num1 = 30, num2 = 4;
float result;
result = (float)(num1/num2);
printf("%.2f", result);
return 0;
}
Answers:
• 7
• 7.00
• 7.000000
• 7.5
• 7.50
36. What is the output of the following
program ?
main()
{
int u = 1, v = 3;
printf("%d %d",u,v);
funct1(&u,&v);
printf(" %d %d\n",u,v);
}
void funct1(int *pu, int *pv)
{
*pu=0;
*pv=0;
return;
}
Answers:
• 1 3 1 3
• 1 3 1 1
• 1 3 0 0
• 1 1 1 1
• 3 1 3 1
37. Which of the following is/are the correct signature/s
of main with command line arguments?
Answers:
• int main(int
argc, char **argv)
• int main(int argc, char
*argv[])
• int main(int
argc, char *argv)
• int main(int
argc, char argv[])
• All of the
above
38. From which of the following loop or conditional
constructs, is "break" used for an early exit?
Answers:
• switch
• for
• while
• do-while
• All of the above
39. Given the operators:
1) *
2) /
3) %
What would be the order of precedence?
Answers:
• 1,2,3
• 1,3,2
• 3,2,1
• All have the
same precedence
• 1 and 2 have the same
precedence, 3 is of lower precedence
40. Which of the following declarations of
structures is/are valid?
1)
struct node {
int count;
char *word;
struct node next;
}Node;
2)
struct node {
int count;
char *word;
struct node *next;
}Node;
3)
struct node {
int count;
char *word;
union u1 {
int
n1;
float f1;
}U;
}Node;
Answers:
• 1,2,3
• 1,2
• 2,3
• 2
• None of the
above
41. What would be printed on the standard
output as a result of the following code snippet?
main( )
{
char *str[ ] = {
"Manish"
"Kumar"
"Choudhary"
};
printf ( "\nstring1 = %s", str[0] );
printf ( "\nstring2 = %s", str[1] );
printf ( "\nstring3 = %s", str[2] );
}
Answers:
• string1 =
Manish string2 = Kumar string3 = Choudhary
• string1 =
Manish string2 = Manish string3 = Manish
• string1 =
ManishKumarChoudhary string2 = (null) string3 = (null)
• You will get an
error message from the compiler
42. What would be printed on the standard
output as a result of the following code snippet?
main()
{
int
n=5, x;
x =
n++;
printf("%d ", x);
x =
++n;
printf("%d ", x++);
printf("%d", x);
return 0;
}
Answers:
• 6 7 8
• 5 7 8
• 6 8 8
• 5 8 8
• None of the
above
43. In which area of memory are static
variables allocated?
Answers:
• stack
• heap
• With the code
binary
• None of the
above
44. Which standard function is used to
deallocate memory allocated by the malloc() function?
Answers:
• free
• calloc
• delete
• release
• destroy
45. Read the statement below:
extern int a;
Which of the following statement/s pertaining
to the above statement is/are correct?
Answers:
• Declares an
integer variable a; Allocates storage for the variable
• Declares an
integer variable a; Does not allocate the storage for the variable
• Indicates that
the variable is defined outside the current file
• Brings the scope of the
variable defined outside the file to this file
• All of the
above
• None of the
above
46. The declaration int (*p[5])() means:
Answers:
• p is an array of pointers
to functions the return type of which is an integer
• p is a pointer
to a function that returns a pointer to an integer
• p is a pointer
to an array of integers
• p is a pointer
to an array of integer pointers
• p is a pointer
to a character string
47. What will be printed on the standard
output as a result of the following code snippet?
void main()
{
int
arr[5]={1,2,3,4,5};
printf("%d\n", *(arr+4));
}
Answers:
• 1
• 2
• 4
• 5
• Cannot be
determined
48. What would be printed on the standard
output as a result of the following code snippet?
main()
{
char *pmessage = "asdfgh";
*pmessage++;
printf("%s", pmessage);
return 0;
}
Answers:
• Will result in Compilation
Error
• Undefined
string
• sdfgh
• asdfgh
49. Which function returns the current pointer
position within a file?
Answers:
• ftell()
• fseek()
• fgetc()
• fread()
• fscanf()
50. Which of the following is not a relational
operator?
Answers:
• ==
• !=
• <>
• >=
• <=
51. What does the argv[0] represent?
Answers:
• The first
command line parameter has been passed to the program
• The program name
• The number of
command line arguments
• None of the
above
52. What will happen when the following code is
executed?
void main()
{
char arr1[] =
"REGALINT";
char arr2[10] =
"REGALINT";
printf("%d,",sizeof(arr1));
printf("%d",sizeof(arr2));
}
Answers:
• 1,1
• 1,4
• 8,8
• 8,9
• 9,10
53. What will be the output of the following
program?
#include <assert.h>
main()
{
int n = 5;
assert(n > 3); //statement 1
n = n+2;
assert(n > 7);//statement 2
return 0;
}
Answers:
• Assertion 'n
> 3' failed; Program aborts at statement 1
• Assertion 'n > 7'
failed; Program aborts at statement 2
• Program returns
0 with the value of n as 7
• Compilation
Error
54. Which of the following is a function for
formatting data in memory?
Answers:
• sprintf()
• printf()
• scanf()
• free()
• atol()
55. Which function allocates memory and
initializes elements to 0?
Answers:
• assign()
• calloc()
• malloc()
• swab()
• allocate()
56. Is the following statement correct? If
not, why not? If yes, what is the size of the array?
int array[][3] = { {1,2}, {2,3}, {3,4,2} };
Answers:
• Yes, the size is three
columns by two rows
• Yes, the size
is two columns by two rows
• No, the first
dimension is omitted
• No, one of the
three initializer sets contains too many numbers
• Yes, the size
is three columns by three rows
57. Which of the following sets of conversion
statements may result in the loss of data?
Answers:
• int i; char c;
i=c; c=i;
• int i; char c;
c=i; i=c;
• int i; float f; i=f; f=i;
• None of the
above
58. Consider the following code.
int i = 4, *j, *k;
Which one of the following statements will result
in Compilation error?
Answers:
• j = &i;
• j = j + 4;
• j = j - 2;
• k = j + 3;
• j = j * 2;
59. What would be printed on the standard
output as a result of the following code snippet?
main()
{
enum {red, green, blue = 0, white};
printf("%d
%d %d %d", red, green, blue, white);
return 0;
}
Answers:
• Will result in
Compilation Error
• 0 1 2 3
• 0 1 0 1
• 0 1 0 2
• Undefined
60. By which file function you can position
the file pointer in accordance with the current position?
Answers:
• ftell()
• fseek()
• fgetc()
• fread()
• fscanf()
61. What is wrong with the following function
prototype statement?
int func();
Answers:
• The function
definition {...} is missing
• While calling a function,
the type int is not needed
• No parameter
has been passed
• The semicolon
should not be there
• There is
nothing wrong with the statement
62. What will be printed on the standard
output as a result of the following code snippet?
void main()
{
char arr[] = {'R','A','M'};
printf("%d",strlen(arr));
}
Answers:
• 0
• 1
• 3
• 4
• Cannot be determined
63. What will be printed on the standard
output as a result of the following code snippet?
void main()
{
int
arr[][2] = {1,2,3,4,5,6};
printf("%d",arr[2][1]);
}
Answers:
• 2
• 3
• 4
• 5
• 6
64. What would be printed on the standard
output as a result of the following code snippet?
#include<stdio.h>
main()
{
unsigned char a=255;
a =
a+1;
printf("%d",a);
return
0;
}
Answers:
• Undefined value
• 256
• 1
• 0
• -1
65. Which of the following is not a storage
type?
Answers:
• auto
• global
• static
• register
• extern
66. If a two dimensional array arr[4][10](an array
with 4 rows and 10 columns) is to be passed in a function, which of the
following would be the valid parameters in the function definition?
Answers:
• fn(int arr[4][10])
• fn(int
arr[][10])
• fn(int
arr[4][])
• fn(int
(*fn)[13])
• None of the
above
67. Which function will you use to position
the file pointer at the beginning of the file?
Answers:
• rewind()
• fseek()
• fscanf()
• a or b
• b or c
68. Which of the following is not a string
function?
Answers:
• strlen()
• strcmp()
• strcpy()
• strcomp()
69. What would be printed on the standard
output as a result of the following code snippet?
char i = 'A';
char *j;
j = & i;
*j = *j + 32;
printf("%c",i);
Answers:
• An error will
occur
• a
• A
• b
• c
70. What will be printed on the standard
output as a result of the following code snippet?
void main()
{
char arr1[] = "REGALINT";
printf("%d,",strlen(arr1));
printf("%d",sizeof(arr1));
}
Answers:
• 1,1
• 8,4
• 8,8
• 8,9
• 9,8
71. What will be printed on the standard
output as a result of the following code snippet?
int funr(int x, int y)
{
if(x <= 0)
{
return
y;
}
else
{
return (1+funr(x-1,y));
}
}
void main()
{
printf("%d",funr(2,3));
}
Answers:
• 2
• 3
• 5
• 6
• 9
72. Which header file are methods(or macros)
isalpha(), islower() a part of?
Answers:
• stdio.h
• ctype.h
• string.h
• math.h
• None of the
above
73. What would be printed on the standard
output as a result of the following code snippet?
#define Name Manish
main()
{
printf("My name""Name");
}
Answers:
• My name Manish
• My nameName
• Results in
Compilation Error
• None of the
above
74. What will be printed on the standard
output as a result of the following code snippet?
void main()
{
int i,j,k;
i=4;
j=30;
k=0;
k=j++/i++;
++k;
printf("%d %d
%d",i,j,k);
}
Answers:
• 5 31 8
• 5 31 7
• 5 31 6
• 4 30 7
75. What will be printed on the standard
output as a result of the following code snippet?
main()
{
int
num = 425;
printf("%d", printf("%d", num));
}
Answers:
• Will result in
Compilation Error
• 4425
• 4253
• 3435
• None of the
above
76. What would be printed on the standard
output as a result of the following code snippet?
main()
{
signed char i = 1;
for
(; i<=255; i++)
printf ("%d ",i);
return 0;
}
Answers:
• Compilation
Error
• 1 2 3 ... 255
• 1 2 3 . . . 127
• 1 2 3 . . . 127 -128 -127
... 0 1 2 3 . . . (infinite times)
77. What would be printed on the standard
output as a result of the following code snippet?
#define max(a, b) ((a) > (b)?(a):(b))
main()
{
int
a=4;
float b=4.5;
printf("%.2f\n",max(a, b));
}
Answers:
• Results in
Compilation Error
• Undefined value
• 4.50
• 4.0
• None of the
above
78. Which of the following is not a file
related function?
Answers:
• fgetc()
• puts()
• fputc()
• fscanf()
• fprintf()
79. What would be printed on the standard
output as a result of the following code snippet?
main()
{
enum {red, green, blue = 6, white};
printf("%d %d %d %d", red, green,
blue, white);
return 0;
}
Answers:
• 0 1 6 2
• 0 1 6 7
• Will result in
Compilation Error
• None of the
above
80. What would be printed on the standard
output as a result of the following code snippet?
main()
{
int a[5] = {1,4,5,6,9};
printf("%d\t",
*a); //Line 1
printf("%d",
*++a); //Line 2
return 0;
}
Answers:
• 1 4
• 0 1
• Undefined value
• Compilation
Error in "Line 1"
• Compilation Error in
"Line 2"
81. What would be printed on the standard
output as a result of the following code snippet?
#define max(a, b)((a) > (b)?(a):(b))
main()
{
int a=4, c = 5;
printf("%d ", max(a++, c++));
printf("%d %d\n", a,c);
}
Answers:
• Results in
Compilation Error
• 6 4 5
• 6 5 7
• 6 5 6
• None of the
above
82. Which of the following file modes would
mean read + append?
Answers:
• w+
• a+
• r+
• r+a
• a+r
83. Which of the following standard functions
is used to close a file?
Answers:
• fileclose()
• closefile()
• fclose()
• Any of the
above
84. What would be printed on the standard
output as a result of the following code snippet?
int Recur(int num)
{
if(num==1 || num==0)
return 1;
if(num%2==0)
return Recur(num/2)+2;
else
return Recur(num-1)+3;
}
int main()
{
int
a=9;
printf("%d\n", Recur(a));
return 0;
}
Answers:
• 10
• 9
• 11
• 8
• None of the
above
85. Identify the incorrect statement.
Answers:
• Records can be
defined in C by using structures
• Structure
members can be of the same/different data types
• Memory is reserved when a
structure label is defined
• A pointer to a
structure can be used to pass a structure to a function
• Arrays of
structures can be defined and initialized
86. What will happen when the following code
is executed?
{
int num;
num =0;
do {-- num;
printf("%d\n", num);
num++;
} while (num >=0);
}
Answers:
• The loop will run
infinitely
• The program
will not enter the loop
• There will be a
compilation error
• A runtime error
will be reported
87. Which of the following functions is used
to extract formatted input from a file?
Answers:
• fputc()
• fputs()
• fprintf()
• fscanf()
• ftell()
88. What does the following function do?
int fn(unsigned int x)
{
int
count = 0;
for(; x!=0; x&=(x-1))
count++;
return count;
}
Answers:
• Returns the
minimum number of bits required to represent the number x
• Returns the
number of zero bits present in the number x
• Returns the number of 1
bits(bits having one) in the number x
• Returns the
square root of the number
• None of the
above
