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 [英] i did't get output in constructor program, this program No ERROR but result is display zero

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());
}
}

推荐答案

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

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