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40+ Introduction to C Language Solved MCQs

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Chapter: Introduction to C Language
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» D. None of the mentioned
discuss (1)
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» C. int 3_a;
discuss
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» C. To avoid conflicts since library routines use such names
discuss
4.

All keywords in C are in ____________

A. LowerCase letters
B. UpperCase letters
C. CamelCase letters
D. None of the mentioned
Answer» A. LowerCase letters
discuss
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
Answer» A. Compiler and linker implementations
discuss
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;
Answer» D. int $main;
discuss
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
Answer» C. Variable names cannot start with a digit
discuss
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
Answer» C. Short is the qualifier and int is the basic data type
discuss
9.

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

A. char
B. int
C. float
D. double
Answer» B. int
discuss
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
Answer» B. unsigned short
discuss
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
Answer» D. all of the mentioned
discuss
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
Answer» C. Depends on the system/compiler
discuss
13.

enum types are processed by _________

A. Compiler
B. Preprocessor
C. Linker
D. Assembler
Answer» A. Compiler
discuss
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
Answer» A. Constant variables need not be defined as they are declared and can be defined later
discuss
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;
Answer» A. String str;
discuss
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””;
Answer» D. char[] str = “string Contents””;
discuss
17.

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

A. immutable
B. mutable
C. const
D. volatile
Answer» C. const
discuss
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;
Answer» D. char a;
discuss
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
Answer» C. A variable must be declared and defined at the same time
discuss
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
Answer» B. False
discuss
21.

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

A. %, *, /, +, –
B. %, +, /, *, –
C. +, -, %, *, /
D. %, +, -, *, /
Answer» A. %, *, /, +, –
discuss
22.

Which of the following is not an arithmetic operation?

A. a * = 10;
B. a / = 10;
C. a ! = 10;
D. a % = 10;
Answer» C. a ! = 10;
discuss
23.

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

A. char
B. short
C. int
D. float
Answer» D. float
discuss
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. +, -, *, /, %
Answer» A. +, –
discuss
25.

Are logical operator sequence points?

A. True
B. False
C. Depends on the compiler
D. Depends on the standard
Answer» A. True
discuss
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
Answer» A. True
discuss
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
Answer» B. 0 or 1
discuss
28.

Relational operators cannot be used on ____________

A. structure
B. long
C. strings
D. float
Answer» A. structure
discuss
29.

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

A. !=
B. ==
D. =
Answer» D. =
discuss
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
Answer» A. int
discuss (1)
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
Answer» A. 2
discuss
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
Answer» D. All of the mentioned
discuss
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;
Answer» D. c = 4;
discuss
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
Answer» A. Compiler
discuss
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
Answer» B. Q and R
discuss
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
Answer» D. Output is compiler dependent
discuss
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));
Answer» D. Both e = ((a * b) + (c / (d * f))); and e = ((a * b) + ((c / d)* f));
discuss
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
Answer» B. Data type should be either of float and double
discuss
39.

function tolower(c) defined in library <ctype.h> works for ___________

A. Ascii character set
B. Unicode character set
C. Ascii and utf-8 but not EBCDIC character set
D. Any character set
Answer» D. Any character set
discuss
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
Answer» B. From float to char pointer
discuss
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
Answer» B. From int to char
discuss
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
Answer» C. Widening & Narrowing conversions
discuss
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
Answer» D. All of the mentioned
discuss
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
Answer» D. From the point of declaration to the end of the file being compiled
discuss
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
Answer» D. From the point of declaration to the end of the file being compiled
discuss
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
Answer» A. math.h
discuss
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.
Answer» C. rem = fmod(3.14, 2.1);
discuss
48.

By default a real number is treated as a

A. A.float
B. B.double
C. C.long double
D. D. far double
Answer» B. B.double
discuss

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