TechZoom24-BugBash_Prelims

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

• float rate;

• int variable_count;

• int $main;

• int number;

Answer explanation

The variable name int $main; is not valid in C because it contains a special character ($). Variable names in C cannot start with special characters.

Which of the following statements best explains why C is not considered a platform-independent programming language?

• C does not have a standard specification.

• C programs cannot be compiled on different operating systems.

• C code is not capable of running on embedded systems.

• C code may rely on platform-specific features and behaviors.

Answer explanation

C code may rely on platform-specific features and behaviors, making it not considered a platform-independent programming language.

What is #include ?

• Preprocessor directive

• Inclusion directive

• File inclusion directive

• None of the mentioned

Answer explanation

The correct choice is 'Preprocessor directive' because #include is used in C/C++ to include the contents of another file during compilation.

What is meant by 'a' in the following C operation? fp = fopen("Random.txt", "a");

• Attach

• Append

• Apprehend

• Add

Answer explanation

The 'a' in the fopen() function stands for 'Append', which means the file will be opened for writing at the end of the file, preserving the existing content.

What will be the output of the following C code?

• Compile time error

• Hello World! 34

• Hello World! 1000

• Hello World! followed by a junk value

Answer explanation

The correct answer is 'Compile time error' because the code is missing the 'main' function which is required in C programs.

What are mandatory parts in the function declaration in c?

• return type, function name

• return type, function name, parameters

• parameters, function name

• parameters, variables

Answer explanation

The mandatory parts in a function declaration in C are the return type and the function name.

Which is more effective while calling the functions?

• call by value

• call by reference

• call by pointer

• call by object

Answer explanation

Call by reference is more effective while calling functions as it allows the function to directly access and modify the original data without making a copy.

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

• 23

• 43

• compile time error

• 30

Answer explanation

The code outputs 23 because the value of x is incremented by 3 before being passed to the function, which then increments it by 20. Therefore, the final value printed is 23.

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

• 11

• 7

• 9

• 8

Answer explanation

The code increments x by 1, then assigns x to y, and finally increments y by 1. So, x=4, y=5. The code then prints x+y, which is 8.

What is the scope of the variable declared in the user defined function?

• whole program

• only inside the {} block

• the main function

• header section

Answer explanation

The scope of the variable declared in a user-defined function is only inside the {} block, meaning it is limited to the function where it is declared.