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What is the output of the following Java program?
final class Complex {
private double re, im;
public Complex(double re, double im) {
this.re = re;
this.im = im;
}
Complex(Complex c) {
System.out.println("Copy constructor called");
re = c.re;
im = c.im;
}
public String toString() {
return "(" + re + " + " + im + "i)";
}
}
class Main {
public static void main(String[] args) {
Complex c1 = new Complex(10, 15);
Complex c2 = new Complex(c1);
Complex c3 = c1;
System.out.println(c2);
}
}
private double re, im;
public Complex(double re, double im) {
this.re = re;
this.im = im;
}
Complex(Complex c) {
System.out.println("Copy constructor called");
re = c.re;
im = c.im;
}
public String toString() {
return "(" + re + " + " + im + "i)";
}
}
class Main {
public static void main(String[] args) {
Complex c1 = new Complex(10, 15);
Complex c2 = new Complex(c1);
Complex c3 = c1;
System.out.println(c2);
}
}
- a)Copy constructor called
(10.0 + 15.0i) - b)Copy constructor called
(0.0 + 0.0i) - c)(10.0 + 15.0i)
(0.0 + 0.0i) - d)(10.0 + 15.0i)
(10.0 + 15.0i)
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
What is the output of the following Java program?final class Complex {...
Understanding the Java Program
The provided Java program demonstrates the use of a class named `Complex` that represents complex numbers.
Key Components of the Program
- Class Definition:
- The `Complex` class has two private fields, `re` (real part) and `im` (imaginary part).
- It includes a constructor that initializes these fields and a copy constructor that creates a new `Complex` object based on another `Complex` object.
- Copy Constructor:
- When a new `Complex` object is created using the copy constructor (e.g., `Complex c2 = new Complex(c1);`), it prints "Copy constructor called" to the console.
Program Execution Flow
1. Object Creation:
- `Complex c1 = new Complex(10, 15);` initializes `c1` with `re = 10` and `im = 15`.
2. Copy Constructor Invocation:
- `Complex c2 = new Complex(c1);` invokes the copy constructor, which prints "Copy constructor called" and copies the values of `c1` into `c2` (i.e., `c2.re = 10` and `c2.im = 15`).
3. Reference Assignment:
- `Complex c3 = c1;` assigns `c3` to refer to the same object as `c1`.
4. Output:
- Finally, `System.out.println(c2);` calls the `toString` method of `c2`, which returns the string representation of the complex number as "(10.0 + 15.0i)".
Final Output
- Therefore, the output is:
Copy constructor called
(10.0 + 15.0i)
This matches option a), confirming that "Copy constructor called" is printed first, followed by the string representation of `c2`.
The provided Java program demonstrates the use of a class named `Complex` that represents complex numbers.
Key Components of the Program
- Class Definition:
- The `Complex` class has two private fields, `re` (real part) and `im` (imaginary part).
- It includes a constructor that initializes these fields and a copy constructor that creates a new `Complex` object based on another `Complex` object.
- Copy Constructor:
- When a new `Complex` object is created using the copy constructor (e.g., `Complex c2 = new Complex(c1);`), it prints "Copy constructor called" to the console.
Program Execution Flow
1. Object Creation:
- `Complex c1 = new Complex(10, 15);` initializes `c1` with `re = 10` and `im = 15`.
2. Copy Constructor Invocation:
- `Complex c2 = new Complex(c1);` invokes the copy constructor, which prints "Copy constructor called" and copies the values of `c1` into `c2` (i.e., `c2.re = 10` and `c2.im = 15`).
3. Reference Assignment:
- `Complex c3 = c1;` assigns `c3` to refer to the same object as `c1`.
4. Output:
- Finally, `System.out.println(c2);` calls the `toString` method of `c2`, which returns the string representation of the complex number as "(10.0 + 15.0i)".
Final Output
- Therefore, the output is:
Copy constructor called
(10.0 + 15.0i)
This matches option a), confirming that "Copy constructor called" is printed first, followed by the string representation of `c2`.
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Community Answer
What is the output of the following Java program?final class Complex {...
The copy constructor is called when c2 is created from c1, initializing c2 with the values of c1.
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What is the output of the following Java program?final class Complex { private double re, im; public Complex(double re, double im) { this.re = re; this.im = im; } Complex(Complex c) { System.out.println("Copy constructor called"); re = c.re; im = c.im; } public String toString() { return "(" + re + " + " + im + "i)"; } }class Main { public static void main(String[] args) { Complex c1 = new Complex(10, 15); Complex c2 = new Complex(c1); Complex c3 = c1; System.out.println(c2); }}a)Copy constructor called(10.0 + 15.0i)b)Copy constructor called(0.0 + 0.0i)c)(10.0 + 15.0i)(0.0 + 0.0i)d)(10.0 + 15.0i)(10.0 + 15.0i)Correct answer is option 'A'. Can you explain this answer? for EmSAT Achieve 2025 is part of EmSAT Achieve preparation. The Question and answers have been prepared according to the EmSAT Achieve exam syllabus. Information about What is the output of the following Java program?final class Complex { private double re, im; public Complex(double re, double im) { this.re = re; this.im = im; } Complex(Complex c) { System.out.println("Copy constructor called"); re = c.re; im = c.im; } public String toString() { return "(" + re + " + " + im + "i)"; } }class Main { public static void main(String[] args) { Complex c1 = new Complex(10, 15); Complex c2 = new Complex(c1); Complex c3 = c1; System.out.println(c2); }}a)Copy constructor called(10.0 + 15.0i)b)Copy constructor called(0.0 + 0.0i)c)(10.0 + 15.0i)(0.0 + 0.0i)d)(10.0 + 15.0i)(10.0 + 15.0i)Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for EmSAT Achieve 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the output of the following Java program?final class Complex { private double re, im; public Complex(double re, double im) { this.re = re; this.im = im; } Complex(Complex c) { System.out.println("Copy constructor called"); re = c.re; im = c.im; } public String toString() { return "(" + re + " + " + im + "i)"; } }class Main { public static void main(String[] args) { Complex c1 = new Complex(10, 15); Complex c2 = new Complex(c1); Complex c3 = c1; System.out.println(c2); }}a)Copy constructor called(10.0 + 15.0i)b)Copy constructor called(0.0 + 0.0i)c)(10.0 + 15.0i)(0.0 + 0.0i)d)(10.0 + 15.0i)(10.0 + 15.0i)Correct answer is option 'A'. Can you explain this answer?.
What is the output of the following Java program?final class Complex { private double re, im; public Complex(double re, double im) { this.re = re; this.im = im; } Complex(Complex c) { System.out.println("Copy constructor called"); re = c.re; im = c.im; } public String toString() { return "(" + re + " + " + im + "i)"; } }class Main { public static void main(String[] args) { Complex c1 = new Complex(10, 15); Complex c2 = new Complex(c1); Complex c3 = c1; System.out.println(c2); }}a)Copy constructor called(10.0 + 15.0i)b)Copy constructor called(0.0 + 0.0i)c)(10.0 + 15.0i)(0.0 + 0.0i)d)(10.0 + 15.0i)(10.0 + 15.0i)Correct answer is option 'A'. Can you explain this answer? for EmSAT Achieve 2025 is part of EmSAT Achieve preparation. The Question and answers have been prepared according to the EmSAT Achieve exam syllabus. Information about What is the output of the following Java program?final class Complex { private double re, im; public Complex(double re, double im) { this.re = re; this.im = im; } Complex(Complex c) { System.out.println("Copy constructor called"); re = c.re; im = c.im; } public String toString() { return "(" + re + " + " + im + "i)"; } }class Main { public static void main(String[] args) { Complex c1 = new Complex(10, 15); Complex c2 = new Complex(c1); Complex c3 = c1; System.out.println(c2); }}a)Copy constructor called(10.0 + 15.0i)b)Copy constructor called(0.0 + 0.0i)c)(10.0 + 15.0i)(0.0 + 0.0i)d)(10.0 + 15.0i)(10.0 + 15.0i)Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for EmSAT Achieve 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the output of the following Java program?final class Complex { private double re, im; public Complex(double re, double im) { this.re = re; this.im = im; } Complex(Complex c) { System.out.println("Copy constructor called"); re = c.re; im = c.im; } public String toString() { return "(" + re + " + " + im + "i)"; } }class Main { public static void main(String[] args) { Complex c1 = new Complex(10, 15); Complex c2 = new Complex(c1); Complex c3 = c1; System.out.println(c2); }}a)Copy constructor called(10.0 + 15.0i)b)Copy constructor called(0.0 + 0.0i)c)(10.0 + 15.0i)(0.0 + 0.0i)d)(10.0 + 15.0i)(10.0 + 15.0i)Correct answer is option 'A'. Can you explain this answer?.
Solutions for What is the output of the following Java program?final class Complex { private double re, im; public Complex(double re, double im) { this.re = re; this.im = im; } Complex(Complex c) { System.out.println("Copy constructor called"); re = c.re; im = c.im; } public String toString() { return "(" + re + " + " + im + "i)"; } }class Main { public static void main(String[] args) { Complex c1 = new Complex(10, 15); Complex c2 = new Complex(c1); Complex c3 = c1; System.out.println(c2); }}a)Copy constructor called(10.0 + 15.0i)b)Copy constructor called(0.0 + 0.0i)c)(10.0 + 15.0i)(0.0 + 0.0i)d)(10.0 + 15.0i)(10.0 + 15.0i)Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for EmSAT Achieve.
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Here you can find the meaning of What is the output of the following Java program?final class Complex { private double re, im; public Complex(double re, double im) { this.re = re; this.im = im; } Complex(Complex c) { System.out.println("Copy constructor called"); re = c.re; im = c.im; } public String toString() { return "(" + re + " + " + im + "i)"; } }class Main { public static void main(String[] args) { Complex c1 = new Complex(10, 15); Complex c2 = new Complex(c1); Complex c3 = c1; System.out.println(c2); }}a)Copy constructor called(10.0 + 15.0i)b)Copy constructor called(0.0 + 0.0i)c)(10.0 + 15.0i)(0.0 + 0.0i)d)(10.0 + 15.0i)(10.0 + 15.0i)Correct answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
What is the output of the following Java program?final class Complex { private double re, im; public Complex(double re, double im) { this.re = re; this.im = im; } Complex(Complex c) { System.out.println("Copy constructor called"); re = c.re; im = c.im; } public String toString() { return "(" + re + " + " + im + "i)"; } }class Main { public static void main(String[] args) { Complex c1 = new Complex(10, 15); Complex c2 = new Complex(c1); Complex c3 = c1; System.out.println(c2); }}a)Copy constructor called(10.0 + 15.0i)b)Copy constructor called(0.0 + 0.0i)c)(10.0 + 15.0i)(0.0 + 0.0i)d)(10.0 + 15.0i)(10.0 + 15.0i)Correct answer is option 'A'. Can you explain this answer?, a detailed solution for What is the output of the following Java program?final class Complex { private double re, im; public Complex(double re, double im) { this.re = re; this.im = im; } Complex(Complex c) { System.out.println("Copy constructor called"); re = c.re; im = c.im; } public String toString() { return "(" + re + " + " + im + "i)"; } }class Main { public static void main(String[] args) { Complex c1 = new Complex(10, 15); Complex c2 = new Complex(c1); Complex c3 = c1; System.out.println(c2); }}a)Copy constructor called(10.0 + 15.0i)b)Copy constructor called(0.0 + 0.0i)c)(10.0 + 15.0i)(0.0 + 0.0i)d)(10.0 + 15.0i)(10.0 + 15.0i)Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of What is the output of the following Java program?final class Complex { private double re, im; public Complex(double re, double im) { this.re = re; this.im = im; } Complex(Complex c) { System.out.println("Copy constructor called"); re = c.re; im = c.im; } public String toString() { return "(" + re + " + " + im + "i)"; } }class Main { public static void main(String[] args) { Complex c1 = new Complex(10, 15); Complex c2 = new Complex(c1); Complex c3 = c1; System.out.println(c2); }}a)Copy constructor called(10.0 + 15.0i)b)Copy constructor called(0.0 + 0.0i)c)(10.0 + 15.0i)(0.0 + 0.0i)d)(10.0 + 15.0i)(10.0 + 15.0i)Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice What is the output of the following Java program?final class Complex { private double re, im; public Complex(double re, double im) { this.re = re; this.im = im; } Complex(Complex c) { System.out.println("Copy constructor called"); re = c.re; im = c.im; } public String toString() { return "(" + re + " + " + im + "i)"; } }class Main { public static void main(String[] args) { Complex c1 = new Complex(10, 15); Complex c2 = new Complex(c1); Complex c3 = c1; System.out.println(c2); }}a)Copy constructor called(10.0 + 15.0i)b)Copy constructor called(0.0 + 0.0i)c)(10.0 + 15.0i)(0.0 + 0.0i)d)(10.0 + 15.0i)(10.0 + 15.0i)Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice EmSAT Achieve tests.
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