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java - java中的百分比函数

转载 作者：行者123 更新时间：2023-11-29 18:41:09 25 4
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我是一名 11 岁的应用程序程序员，我正在制作一个计算器应用程序。我想添加一个百分比按钮，以便用户可以找到百分比，但是当我输入 100 的 50% 时，它会给我 0，即使正确答案是 50。它还会说其他方程式的错误答案。请帮忙!这是我的 Java 代码:

package com.example.lenovouser.calculatoraghav;
//IMPORT
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
// ASSIGNING THE NAMES OR VARIABLES
TextView result;
EditText number1, number2, txt;
Button 
add,subtract,divide,multiply,squareroot,square,clear,Exponent,percent;
double resultnum;
int num1,num2,num3;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //ASSIGNING THE VARIABLES TO THE ANDROID WIDGETS.
    result = (TextView)findViewById(R.id.sum);
    number1 = (EditText)findViewById(R.id.number1);
    number2 = (EditText)findViewById(R.id.number2);
    txt = (EditText)findViewById(R.id.txt);
    add = (Button)findViewById(R.id.button);
    subtract = (Button)findViewById(R.id.button2);
    multiply = (Button)findViewById(R.id.button3);
    divide = (Button)findViewById(R.id.button4);
    squareroot =(Button)findViewById(R.id.button6);
    square = (Button)findViewById(R.id.button5);
    clear = (Button)findViewById(R.id.button8);
    Exponent = (Button)findViewById(R.id.button9);
    percent = (Button)findViewById(R.id.button10);



    add.setOnClickListener(new View.OnClickListener(){

@Override
    public void onClick(View v){
        //ADD
        num1 = Integer.parseInt(number1.getText() .toString());
        num2 = Integer.parseInt(number2.getText() .toString());
        resultnum = num1 + num2;
        result.setText(String.valueOf(resultnum));
}
});




    subtract.setOnClickListener(new View.OnClickListener(){
        //SUBTRACT
        @Override
        public void onClick(View v){

            num1 = Integer.parseInt(number1.getText() .toString());
            num2 = Integer.parseInt(number2.getText() .toString());
            resultnum = num1 - num2;
            result.setText(String.valueOf(resultnum));
        }
    });




    multiply.setOnClickListener(new View.OnClickListener(){
        //MULTIPLY
        @Override
        public void onClick(View v){

            num1 = Integer.parseInt(number1.getText() .toString());
            num2 = Integer.parseInt(number2.getText() .toString());
            resultnum = num1 * num2;
            result.setText(String.valueOf(resultnum));
        }
    });





    divide.setOnClickListener(new View.OnClickListener(){
        //DIVIDE
        @Override
        public void onClick(View v){

            num1 = Integer.parseInt(number1.getText() .toString());
            num2 = Integer.parseInt(number2.getText() .toString());
            resultnum = num1 / num2;
            result.setText(String.valueOf(resultnum));
        }
    });


    squareroot.setOnClickListener(new View.OnClickListener(){
        //SQUAREROOT
        @Override
        public void onClick(View v){

            num1 = Integer.parseInt(number1.getText() .toString());

            resultnum = (Math.sqrt(num1));
            result.setText(String.valueOf(resultnum));
        }
    });


    square.setOnClickListener(new View.OnClickListener(){
        //SQUARE
        @Override
        public void onClick(View v){

            num1 = Integer.parseInt(txt.getText() .toString());

            resultnum = num1*num1;
            result.setText(String.valueOf(resultnum));
        }
    });


    clear.setOnClickListener(new View.OnClickListener(){

        @Override
        public void onClick(View v){
        //CLEAR
            num1 = (0);
            num2 = (0);
            num3 = (0);
            number1.setText("");
            number2.setText("");
            txt.setText("");
            resultnum = 0;
            result.setText(String.valueOf(resultnum));
        }
    });


    Exponent.setOnClickListener(new View.OnClickListener(){

        @Override
        public void onClick(View v){

            //EXPONENT
            int p = Integer.parseInt(number1.getText() .toString());
            int e = Integer.parseInt(number2.getText() .toString());
            resultnum = (Math.pow((double)p, (double)e));
            result.setText(String.valueOf(resultnum));
        }
    });



    percent.setOnClickListener(new View.OnClickListener(){

        @Override
        public void onClick(View v){

            //PERCENT
            num1 = Integer.parseInt(number1.getText() .toString());
            num2 = Integer.parseInt(number2.getText() .toString());
            resultnum = num1/num2;
            resultnum = resultnum * 100;
            result.setText(String.valueOf(resultnum));
        }
    });
}}

这是我的 xml 代码:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">

<EditText
    android:id="@+id/number1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="26dp"
    android:ems="10"
    android:hint="number1"
    android:inputType="number"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<EditText
    android:id="@+id/number2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="92dp"
    android:ems="10"
    android:hint="number2"
    android:inputType="number"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.502"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<TextView
    android:id="@+id/sum"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="15dp"
    android:layout_marginLeft="15dp"
    android:layout_marginTop="24dp"
    android:text="result"
    android:textSize="25sp"
    app:layout_constraintStart_toStartOf="@+id/button"
    app:layout_constraintTop_toBottomOf="@+id/number2" />

<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="18dp"
    android:background="@android:color/holo_blue_bright"
    android:text="ADD-+"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/sum" />

<Button
    android:id="@+id/button2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="22dp"
    android:background="@android:color/holo_red_light"
    android:text="SUBTRACT--"
    app:layout_constraintStart_toStartOf="@+id/button"
    app:layout_constraintTop_toBottomOf="@+id/button" />

<Button
    android:id="@+id/button3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="23dp"
    android:background="@android:color/holo_green_dark"
    android:text="MULTIPLY-X"
    app:layout_constraintStart_toStartOf="@+id/button2"
    app:layout_constraintTop_toBottomOf="@+id/button2" />

<Button
    android:id="@+id/button4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="52dp"
    android:text="DIVIDE-/"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintStart_toStartOf="@+id/button3"
    tools:background="@android:color/holo_orange_light" />

<Button
    android:id="@+id/button5"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="32dp"
    android:layout_marginEnd="17dp"
    android:layout_marginRight="17dp"
    android:text="Square"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintTop_toTopOf="@+id/button2" />

<Button
    android:id="@+id/button6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:layout_marginLeft="16dp"
    android:layout_marginTop="32dp"
    android:text="Square Root"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="@+id/button2" />

<EditText
    android:id="@+id/txt"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:ems="10"
    android:hint="square number"
    android:inputType="number"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/button4" />

<Button
    android:id="@+id/button8"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:layout_marginLeft="16dp"
    android:layout_marginTop="10dp"
    android:text="CLEAR"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/number2" />

<Button
    android:id="@+id/button9"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="108dp"
    android:layout_marginEnd="16dp"
    android:layout_marginRight="16dp"
    android:text="Exponent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/number2" />

<Button
    android:id="@+id/button10"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginEnd="24dp"
    android:layout_marginRight="24dp"
    android:layout_marginBottom="8dp"
    android:text="Percent"
    app:layout_constraintBottom_toTopOf="@+id/txt"
    app:layout_constraintEnd_toEndOf="parent" />

</android.support.constraint.ConstraintLayout>

到目前为止，计算器在加法、减法等方面表现良好。这是困扰我的百分比。这是我的百分比函数:

        percent.setOnClickListener(new View.OnClickListener(){

        @Override
        public void onClick(View v){

            //PERCENT
            num1 = Integer.parseInt(number1.getText() .toString());
            num2 = Integer.parseInt(number2.getText() .toString());
            resultnum = num1/num2;
            resultnum = resultnum * 100;
            result.setText(String.valueOf(resultnum));
        }
    });
}}

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