Variables

C99 standard guarantees uniqueness of __________ characters for internal names.
1. 31
2. 63
3. 12
4. 14
C99 standard guarantees uniqueness of ___________ characters for external names.
1. 31
2. 6
3. 12
4. 14
Which of the following is not a valid variable name declaration?
1. int __a3;
2. int __3a;
3. int __A3;
4. None of the mentioned
Which of the following is not a valid variable name declaration?
1. int _a3;
2. int a_3;
3. int 3_a;
4. int _3a
Why do variable names beginning with the underscore is not encouraged?
1. It is not standardized
2. To avoid conflicts since assemblers and loaders use such names
3. To avoid conflicts since library routines use such names
4. To avoid conflicts with environment variables of an operating system
All keywords in C are in ____________
1. LowerCase letters
2. UpperCase letters
3. CamelCase letters
4. None of the mentioned
Variable name resolution (number of significant characters for the uniqueness of variable) depends on ___________
1. Compiler and linker implementations
2. Assemblers and loaders implementations
3. C language
4. None of the mentioned
Which of the following is not a valid C variable name?
1. int number;
2. float rate;
3. int variable_count;
4. int $main;
Which of the following is true for variable names in C?
1. They can contain alphanumeric characters as well as special characters
2. It is not an error to declare a variable to be one of the keywords(like goto, static)
3. Variable names cannot start with a digit
4. Variable can be of any length
Which is valid C expression?
1. int my_num = 100,000;
2. int my_num = 100000;
3. int my num = 1000;
4. int $my_num = 10000;
What will be the output of the following C code?
#include
int main()
{
printf("Hello World! %d \n", x);
return 0;
}
1. Hello World! x;
2. Hello World! followed by a junk value
3. Compile time error
4. Hello World!
What will be the output of the following C code?
#include
int main()
{
int y = 10000;
int y = 34;
printf("Hello World! %d\n", y);
return 0;
}
1. Compile time error
2. Hello World! 34
3. Hello World! 1000
4. Hello World! followed by a junk value
Which of the following is not a valid variable name declaration?
1. float PI = 3.14;
2. double PI = 3.14;
3. int PI = 3.14;
4. #define PI 3.14
What will happen if the following C code is executed?
#include
int main()
{
int main = 3;
printf("%d", main);
return 0;
}
1. It will cause a compile-time error
2. It will cause a run-time error
3. It will run without any error and prints 3
4. It will experience infinite looping
What is the problem in the following variable declaration?
float 3Bedroom-Hall-Kitchen?;
1. The variable name begins with an integer
2. The special character ‘-‘
3. The special character ‘?’
4. All of the mentioned
What will be the output of the following C code?

#include
int main()
{
int ThisIsVariableName = 12;
int ThisIsVariablename = 14;
printf("%d", ThisIsVariablename);
return 0;
}
1. The program will print 12
2. The program will print 14
3. The program will have a runtime error
4. The program will cause a compile-time error due to redeclaration
Which of the following cannot be a variable name in C?
1. volatile
2. true
3. friend
4. export
Which statement can print \n on the screen?
1. printf("\\n");
2. printf("n\");
3. printf("n");
4. printf('\n');
How many keywords are there in c ?
1. 32
2. 31
3. 63
4. 64
Which variable has the longest scope in the following C code?
#include
int b;
int main()
{
int c;
return 0;
}
int a;
1. a
2. b
3. c
4. Both a and b

Variables

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