package andycpp;

public class Calculator {
  private int result; // 静态变量，用于存储运行结果
  
  public void add(int n) { 
    result = result + n; 
			}
	public void substract(int n){ 
		result = result - 1; 
	}
	public void multiply(int n){ } // 此方法尚未写好
	public void divide(int n) { 
		result = result / n; 
		}
	public void square(int n) { 
		result = n * n;
	}
	public void squareRoot(int n){ 
		for(;;); 
	}
	public void clear(){ 
		result = 0; 
	} // 将结果清零
	public int getResult(){ 
		return result; 
	}

}