Which of these expressions will return true if the input integer v is a power of two?

CPP - Quiz(MCQ)

(~v & (v â€“ 1)) == 0;

(v | (v â€“ 1)) == 0;

(v | (v + 1)) == 0;

(v & (v â€“ 1)) == 0;

Correct Answer : (v & (v â€“ 1)) == 0;

Explanation : Power of two integers have a single set bit followed by unset bits.

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What is the signature of math in function using command line arguments?

int main(int argc, char **argv);

int main(int argc, char const **argv);

int main(int argc, char const *argv[]);

All of the above

Correct Answer : All of the above

Explanation : Any of the above signature can be used while using command line arguments in C++ programs

Which of the following gives the name of the program if the second parameter to the main fucntion is char **argv?

argv[0]

argv[1]

argv[2]

argv[3]

Correct Answer : argv[0]

Explanation : The first string in the list of command line arguments represents the name of the program which can be accessed by using argv[0].

What does the first parameter of the main function represent?

List of command line arguments

Stack of command line arguments

Number of command line arguments

Dictionary of command line arguments

Correct Answer : Number of command line arguments

Explanation : The first argument of the main() function represents the number of command line arguments that are passed.

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