我没有在构造函数程序中得到输出，该程序没有错误，但结果显示为零

问题描述：

任何人都可以帮助我...如果您发现我的错误，请通知我.并给我解决方案.

any one help me... if you find my mistake please inform me. and give me the solution.

class Testconstructor
{
int x,y;

Testconstructor(int a, int b)
{
x=a;
y=b;
}

/**Testconstructor()
{
x=10;
y=20;
}*/

  int areaa()
    {
      int ar= 1/2*x*y;
System.out.println("Area of triangle :"+ar);
    return ar;
    }
}

class dTestconstructor
{
  public static void main(String args[])
{
  int ar;

Testconstructor a1 = new Testconstructor(10,20);

//a1.Testconstructor(10,20);

//ar=a1.areaa();


System.out.println("Area of triangle :"+ a1.areaa());
}
}

答

int ar= 1/2*x*y;

鉴于x=10和y=20，您具有整数表达式1 / 2 * 10 * 20
无论您以哪种方式查看，它都将返回零.

Given that x=10 and y=20 you have the integer expression 1 / 2 * 10 * 20
which will return zero whichever way you look at it.

这甚至不是问题.您没有得到任何输出，因为您没有尝试输出任何东西.

顺便说一句，areaa是输出内容的唯一方法，当然是对自己的犯罪.您返回值，为什么要在此方法中放入任何输出?这称为函数的副作用，通常应避免这种情况.

—SA

This is not even a question. You did get any output because you did not try to output anything.

By the way, your only method where you output something, areaa is simply a crime, against yourself, of course. You return the value, why putting any output into this method? This is called side-effect of the function, something you usually should avoid.

—SA

我没有在构造函数程序中得到输出，该程序没有错误，但结果显示为零

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