Why constructors are efficient instead of a function init() defined by the user to initialize the data members of an object? - CPP Quiz

CPP - Quiz(MCQ)

Why constructors are efficient instead of a function init() defined by the user to initialize the data members of an object?

A)

Because user may forget to define init() function

B)

Because user may call init() more than once which leads to overwriting values

C)

Because user may forget to call init() using that object leading segmentation fault

D)

All of the above

Correct Answer : All of the above

Explanation : We cannot use init() because as mentioned in options that user may forget to initialize the members which will lead to a segmentation fault. Also if the user calls the init() function more than once it may overwrite the values and may result into disastrous results. Also if any user forgets to define init() function then no object will be initialized whereas if any constructor is not defined in any class the class provides a default constructor for initialization.

Recently Updated in CPP Questions

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

A)

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

B)

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

C)

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

D)

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?

A)

argv[0]

B)

argv[1]

C)

argv[2]

D)

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?

A)

List of command line arguments

B)

Stack of command line arguments

C)

Number of command line arguments

D)

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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