Variables In C Language: MCQs on C Programming Variables

Variables In C Language. Multiple Choice Questions on the topic of Variables In C Language.

Variables In C Language

 

All keywords in C are in ??

a) Lowercase letters
b) Uppercase letters
c) CamelCase letters
d) None of the mentioned

 

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

 

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

a) int number;
b) float rate;
c) int variable_count;
d) int $main;

 

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

Variables In C Language

 

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

 

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

a) float PI = 3.14;
b) double PI = 3.14;
c) int PI = 3.14;
d) #define PI 3.14

 

Which is valid C expression ??

a) int my_num = 100,000;
b) int my_num = 100000;
c) int my num = 1000;
d) int $my_num = 10000;

 

What will be the output of the following C code ??

#include <stdio.h>

int main()
{
printf(“Hello World! %d \n”, x);
return 0;
}

Hello World! x;
b) Hello World! followed by a junk value
c) Compile time error
d) Hello World!

Variables In C Language

 

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

a) volatile
b) true
c) friend
d) export

 

What will be the output of the following C code ??

#include <stdio.h>
int main()
{
int y = 10000;
int y = 34;
printf(“Hello World! %d\n”, y);
return 0;
}

a) Compile time error
b) Hello World! 34
c) Hello World! 1000
d) Hello World! followed by a junk value

 

What will be the output of the following C code ??

#include <stdio.h>
int main()
{
int ThisIsVariableName = 12;
int ThisIsVariablename = 14;
printf(“%d”, ThisIsVariablename);
return 0;
}

a) The program will print 12
b) The program will print 14
c) The program will have a runtime error
d) The program will cause a compile-time error due to redeclaration

 

C99 standard guarantees uniqueness of _____ characters for external names ??

a) 31
b) 6
c) 12
d) 14

Variables In C Language

 

C99 standard guarantees uniqueness of __________ characters for internal names ??

a) 31
b) 63
c) 12
d) 14

 

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

 

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

Variables In C Language

 

What will happen if the following C code is executed ??

#include <stdio.h>

int main()
{
int main = 3;
printf(“%d”, main);
return 0;
}

a) It will cause a compile-time error
b) It will cause a run-time error
c) It will run without any error and prints 3
d) It will experience infinite looping

 

What is the problem in the following variable declaration ??

float 3Bedroom-Hall-Kitchen?;

a) The variable name begins with an integer
b) The special character ‘-‘
c) The special character ‘?’
d) All of the mentioned

 

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