MCQs based on Variable in C language

VARIABLES IN C

Points about variable in C:-

1.Variable is an entity that may change. 

2.Variable is used to hold results and reserve memory for the data.

        datatype variable_name;

3.The naming of variables is done by following the same rules of identifier naming.


Rules for naming a variable:

1. An variable name is any combination of 1 to 31 alphabets, digits, or underscores. 

2. The first character in the variable name must be an alphabet or underscore.

3. No blanks or special symbols other than an underscore can be used in a variable name. 

4. Keywords are not allowed to be used as variables.


Let us build some variables:

1.For speed of car we need to know

2.Distance traveled

3.Time taken to travel the distance


Variables to be declared as

Speed, s1, speed_of_car

Distance, d1, dist

Time, t1, time_of_travel


Basic C and variable declaration MCQ

1.which of the following characterize the typical feature of c language?.

A.high level                                      B.machine independent

C.structured                                     D.all of the above


2.C99 standard guarantees the uniqueness of ____ characters for internal names.

A. 31                                               B. 63 

C. 12                                               D. 14


3.C99 standard guarantees the uniqueness of _____ characters for external names.

A. 31                                                B. 6

C. 12                                                D. 14


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

A. int _a6;                                        B. int a_35;

C. int 9_a;                                        D. int _3a


5. All keywords in C are in?

A. Lower Case letters                      B. Upper Case letters

C. Camel Case letters                     D. all

correct answer: A


6. How many keywords are there in c?

A. 31                                                B. 32

C. 64                                                D. 63

correct Ans: B


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

A. Variable names cannot start with a digit

B. Variable can be of any length

C. They can contain alphanumeric characters as well as special characters

D. Reserved Word can be used as a variable name

correct Answer: A


8. Which of the following cannot be a variable name in C?

A. TRUE                                        B. friend

C. export                                        D. volatile

correct Answer : D


9. What is the output of this program?

 #include <stdio.h>

  int var = 2;

  int main()

  {

    int var = var;

    printf("%d ", var);

    return 0;

  }

A. Garbage Value                        B. 20

C. Compiler Error                        D. None of these

Correct Answer: A


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

a) int number;

b) float rate;

c) int variable_count;

d) int $main;

correct Answer: d




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