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class Complex {

	private double real, imaginary;

	public Complex() {
		real = 0.0;
		imaginary = 0.0;
	}

	public Complex(double r, double i) {
		real = r;
		imaginary = i;
	}

	public void add(Complex c) {
		real += c.real;
		imaginary += c.imaginary;
	}

	public void subtract(Complex c) {
		real -= c.real;
		imaginary -= c.imaginary;
	}

	public String toString() {
		return real + "+" + imaginary + "i";
	}

}
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