Deck 1: Introduction to C Language

Question 1

Which of the following is not a valid variable name declaration?

A)int __a3;
B)int __3a;
C)int __A3;
D)None of the mentioned

Answer 1

None of the mentioned

Question 2

Which of the following is not a valid variable name declaration?

A)int _a3;
B)int a_3;
C)int 3_a;
D)int _3a

Answer 2

int 3_a;

Question 3

Why do variable names beginning with the underscore is not encouraged?

A)It is not standardized
B)To avoid conflicts since assemblers and loaders use such names
C)To avoid conflicts since library routines use such names
D)To avoid conflicts with environment variables of an operating system

Answer 3

To avoid conflicts since library routines use such names

Question 4

All keywords in C are in ____________

A)LowerCase letters
B)UpperCase letters
C)CamelCase letters
D)None of the mentioned

Question 5

Variable name resolution (number of significant characters for the uniqueness of variable) depends on ___________

A)Compiler and linker implementations
B)Assemblers and loaders implementations
C)C language
D)None of the mentioned

Question 6

Which of the following is not a valid C variable name?

A)int number;
B)float rate;
C)int variable_count;
D)int $main;

Question 7

Which of the following is true for variable names in C?

A)They can contain alphanumeric characters as well as special characters
B)It is not an error to declare a variable to be one of the keywords(like goto, static)
C)Variable names cannot start with a digit
D)Variable can be of any length

Question 8

What is short int in C programming?

A)The basic data type of C
B)Qualifier
C)Short is the qualifier and int is the basic data type
D)All of the mentioned

Question 9

The format identifier '%i' is also used for _____ data type.

A)char
B)int
C)float
D)double

Question 10

Which data type is most suitable for storing a number 65000 in a 32-bit system?

A)signed short
B)unsigned short
C)long
D)int

Question 11

Which of the following is a User-defined data type?

A)typedef int Boolean;
B)typedef enum {Mon, Tue, Wed, Thu, Fri} Workdays;
C)struct {char name[10], int age};
D)all of the mentioned

Question 12

What is the size of an int data type?

A)4 Bytes
B)8 Bytes
C)Depends on the system/compiler
D)Cannot be determined

Question 13

enum types are processed by _________

A)Compiler
B)Preprocessor
C)Linker
D)Assembler

Question 14

Which of the following statement is false?

A)Constant variables need not be defined as they are declared and can be defined later
B)Global constant variables are initialized to zero
C)const keyword is used to define constant values
D)You cannot reassign a value to a constant variable

Question 15

Which of the following declaration is not supported by C?

A)String str;
B)char *str;
C)float str = 3e2;
D)Both String str; & float str = 3e2;

Question 16

Which of the following declaration is illegal?

A)char *str = "string Contents";
B)char str[] = "string Contents"";
C)char str[20] = "string Contents"";
D)char[] str = "string Contents"";

Question 17

Which keyword is used to prevent any changes in the variable within a C program?

A)immutable
B)mutable
C)const
D)volatile

Question 18

Which of the following is not a pointer declaration?

A)char a[10];
B)char a[] = {'1', '2', '3', '4'};
C)char *str;
D)char a;

Question 19

Which of the following statement is false?

A)A variable defined once can be defined again with different scope
B)A single variable cannot be defined with two different types in the same scope
C)A variable must be declared and defined at the same time
D)A variable refers to a location in memory

Question 20

A variable declared in a function can be used in main().

A)True
B)False
C)True if it is declared static
D)None of the mentioned

Question 21

What is the precedence of arithmetic operators (from highest to lowest)?

A)%, *, /, +, -
B)%, +, /, *, -
C)+, -, %, *, /
D)%, +, -, *, /

Question 22

Which of the following is not an arithmetic operation?

A)a * = 10;
B)a / = 10;
C)a ! = 10;
D)a % = 10;

Question 23

Which of the following data type will throw an error on modulus operation(%)?

A)char
B)short
C)int
D)float

Question 24

Which among the following are the fundamental arithmetic operators, i.e, performing the desired operation can be done using that operator only?

A)+, -
B)+, -, %
C)+, -, *, /
D)+, -, *, /, %

Question 25

Are logical operator sequence points?

A)True
B)False
C)Depends on the compiler
D)Depends on the standard

Question 26

Do logical operators in the C language are evaluated with the short circuit?

A)True
B)False
C)Depends on the compiler
D)Depends on the standard

Question 27

What is the result of logical or relational expression in C?

A)True or False
B)0 or 1
C)0 if an expression is false and any positive number if an expression is true
D)None of the mentioned

Question 28

Relational operators cannot be used on ____________

A)structure
B)long
C)strings
D)float

Question 29

Which among the following is NOT a logical or relational operator?

A)!=
B)==
C)=

Question 30

What is the type of the following assignment expression if x is of type float and y is of type int? y = x + y;

A)int
B)float
C)there is no type for an assignment expression
D)double

Question 31

What will be the value of the following assignment expression? (x = foo())!= 1 considering foo() returns 2

A)2
B)True
C)1
D)0

Question 32

Operation "a = a * b + a" can also be written as ___________

A)a *= b + 1;
B)(c = a * b)!=(a = c + a);
C)a = (b + 1)* a;
D)All of the mentioned

Question 33

What will be the final value of c in the following C statement? (Initial value: c = 2) c <<= 1;

A)c = 1;
B)c = 2;
C)c = 3;
D)c = 4;

Question 34

In expression i = g() + f(), first function called depends on __________

A)Compiler
B)Associativiy of () operator
C)Precedence of () and + operator
D)Left to write of the expression

Question 35

Which operators of the following have same precedence? P. "!=", Q. "+=", R. "<<="

A)P and Q
B)Q and R
C)P and R
D)P, Q and R

Question 36

Comment on the following statement n = 1; printf("%d, %dn", 3*n, n++);

A)Output will be 3, 2
B)Output will be 3, 1
C)Output will be 6, 1
D)Output is compiler dependent

Question 37

Which is correct representation of C statement? e = a * b + c / d * f;

A)e = (a * (b +(c /(d * f))));
B)e = ((a * b) + (c / (d * f)));
C)e = ((a * b) + ((c / d)* f));
D)Both e = ((a * b) + (c / (d * f))); and e = ((a * b) + ((c / d)* f));

Question 38

While swapping 2 no' what at precautions to be taken care? b = (b / a); a = a * b; b = a / b;

A)Data type should be either of short, int and long
B)Data type should be either of float and double
C)All data types are accepted except for (char *)
D)This code doesn't swap 2 numbers

Question 39

function tolower(c) defined in library works for ___________

A)Ascii character set
B)Unicode character set
C)Ascii and utf-8 but not EBCDIC character set
D)Any character set

Question 40

Which type of conversion is NOT accepted?

A)From char to int
B)From float to char pointer
C)From negative int to char
D)From double to char

Question 41

Which of the following type-casting have chances for wrap around?

A)From int to float
B)From int to char
C)From char to short
D)From char to int

Question 42

Which of the following typecasting is accepted by C?

A)Widening conversions
B)Narrowing conversions
C)Widening & Narrowing conversions
D)None of the mentioned

Question 43

When do you need to use type-conversions?

A)The value to be stored is beyond the max limit
B)The value to be stored is in a form not supported by that data type
C)To reduce the memory in use, relevant to the value
D)All of the mentioned

Question 44

What is the scope of an external variable?

A)Whole source file in which it is defined
B)From the point of declaration to the end of the file in which it is defined
C)Any source file in a program
D)From the point of declaration to the end of the file being compiled

Question 45

What is the scope of a function?

A)Whole source file in which it is defined
B)From the point of declaration to the end of the file in which it is defined
C)Any source file in a program
D)From the point of declaration to the end of the file being compiled

Question 46

In the standard library of C programming language, which of the following header file is designed for basic mathematical operations?

A)math.h
B)conio.h
C)dos.h
D)stdio.h

Question 47

Which of the following statements should be used to obtain a remainder after dividing 3.14 by 2.1 ?

A)rem = 3.14 % 2.1;
B)rem = modf(3.14, 2.1);
C)rem = fmod(3.14, 2.1);
D)Remainder cannot be obtain in floating point division.

Question 48

By default a real number is treated as a

A)float
B)double
C)long double
D) far double