Question & Answer: Question 67 Which of the following statements about constructors is true? Answers a. A constructor can have any name b. T…..

Question 67 Which of the following statements about constructors is true? Answers a. A constructor can have any name b. There can be one and only one constructor in an object oriented program c. A constructor is never passed any arguments d. All of a through c are true statements e. None of a through c are true statements

Question 67 Which of the following statements about constructors is true? Answers a. A constructor can have any name b. There can be one and only one constructor in an object oriented program c. A constructor is never passed any arguments d. All of a through c are true statements e. None of a through c are true statements

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(67)

Thus the correct option is (e) None of a through c are true statements.

(A) A constructor can have any name is False

Due to Reason is

Constructor have same name as class name

Example:

class test{

int x,y;

public:

//Default constructor

test(){

 

}

 

//parameter constructor

test(int a,int b){

x =a;

y =b;

 

}

};

(B) There can be one and only one constructor in an object oriented program is False.

  • Object oriented program supports multiple constructors in a program.
  • Constructor used to initialize the object of the class.

(C) A Constructor is never passed any arguments is False.

  • Constructors are allowed to pass arguments.
  • It will used initialize the variables of class.

Example:

//parameter constructor   

test(int a,int b){

x =a;

y =b;

 

}

(D) All of a through c is true statements are False.

  • From the explanation of above (A),(B),(C) statements is False.

//Code Image

//Sample Output

//Code to copy

#include<iostream>

using namespace std;

class test {

private:

int x, y;

public:

int sum(); //returns the sum of the private data members

void print(); //prints the values of the private data members

// the x value followed by the y value

test(); //initializes the private data member to 0

test(int, int); //initializes the private datam member to the passed in values:

// x = value of the first argument

// y = value of the second argument

};

/*Implementation of sum method*/

int test:: sum() {

int sum;

sum = x + y;

return sum;

}

/*Implementation of print method*/

void test::print() {

cout << x << “t” << y << endl;

}

/*Implementation of Defualt Constructor */

test::test() {

}

/*Implementation of Parameterized Constructor */

test::test(int a, int b) {

x = a;

y = b;

}

int main()

{

test t1 = test();

test t2 = test(240, 360);

t1.print();

system(“pause”);

return 0;

}

//Explanation

Thus the correct option is (c)

It displays garbage values because no values were passed when object t1 was created.

  • When try to call the values x and y through the object t1 of the test class, but not initialized the values of x and y.
  • So for that reason it will display the garbage values for x and y through t1.print () method.

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