package open;

public class sizeyunsuan {

	public double add(double add1, double add2) {
		//加法
		double result;
		result = add1 + add2;
		return result;
	}
	
	public double subtract(double sub1, double sub2) {
		//减法
		double result;
		result = sub1 - sub2;
		return result;
	}
	
	public double multiply(double mul1, double mul2) {
		//乘法
		double result;
		result = mul1 * mul2;
		return result;
	}
	
	public double divide(double div1, double div2) {
		//除法
		double result;
		result = div1 / div2;
		return result;
	}
}