① 編程實現對兩個數進行加減乘除,要求輸入值和輸出值保留四位小數
#include<stdio.h>
void main()
{ double a,b,c;
int x;
scanf("%lf%lf",&a,&b);
x=a*10000+0.5; a=x/10000; x=b*10000+0.5; b=x/10000;
c=a+b; printf("%.4lf+%.4lf=%.4lf\n",a,b,c);
c=a-b; printf("%.4lf-%.4lf=%.4lf\n",a,b,c);
c=a*b; printf("%.4lfx%.4lf=%.4lf\n",a,b,c);
if ( b!=0 ) { c=a/b; printf("%.4lf/%.4lf=%.4lf\n",a,b,c); }
}
② c語言實現簡單的加減乘除
1、打開C-Free5.0新建一個空白頁面,然後將C語言的基礎格式寫完,注意格式縮進。如下圖所示。
③ 怎樣用C語言編寫一個簡單的可以進行加減乘除運算混合運算的計算器
用C語言編寫一個簡單的可以進行加減乘除運算混合運算的計算器的方法:
1、打開visual C++ 6.0-文件-新建-文件-C++ Source File;
④ java中,用布局器實現計算器界面 並實現加減乘除等功能,怎樣編程
java寫的,可行
package ex1;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.JTextField;
public class Calcutor extends JFrame {
private JTextField tf;
private JPanel panel1, panel2, panel3, panel4;
private JMenuBar myBar;
private JMenu menu1, menu2, menu3;
private JMenuItem editItem1, editItem2, help1, help2, help3;
private JRadioButtonMenuItem seeItem1, seeItem2;//單選框
private JCheckBoxMenuItem seeItem3;//復選框
private ButtonGroup bgb;
private String back;
private boolean IfResult = true, flag = false;
private String oper = "=";
private double result = 0;
private Num numActionListener;
private DecimalFormat df;
public Calcutor(){
super("科學計算器");//設置標題欄
df = new DecimalFormat("#.####");//保留四位小數
this.setLayout(new BorderLayout(10, 5));
panel1 = new JPanel(new GridLayout(1, 3, 10, 10));
panel2 = new JPanel(new GridLayout(5, 6, 5, 5));//5行6列
panel3 = new JPanel(new GridLayout(5, 1, 5, 5));
panel4 = new JPanel(new BorderLayout(5, 5));
/**
* 菜單欄
*/
myBar = new JMenuBar();
menu1 = new JMenu("編輯(E)");
menu2 = new JMenu("查看(V)");
menu3 = new JMenu("幫助(H)");
menu1.setFont(new Font("宋體", Font.PLAIN, 12));
menu2.setFont(new Font("宋體", Font.PLAIN, 12));
menu3.setFont(new Font("宋體", Font.PLAIN, 12));
/**
* 編輯欄
*/
editItem1 = new JMenuItem("復制(C) Ctrl+C");
editItem2 = new JMenuItem("粘貼(P) Ctrl+V");
editItem1.setFont(new Font("宋體",Font.PLAIN,12));
editItem2.setFont(new Font("宋體",Font.PLAIN,12));
/**
* 查看欄
*/
seeItem1 = new JRadioButtonMenuItem("科學型(T)");
seeItem2 = new JRadioButtonMenuItem("標准型(S)");
seeItem3 = new JCheckBoxMenuItem("數字分組(I)");
seeItem1.setFont(new Font("宋體",Font.PLAIN,12));
seeItem2.setFont(new Font("宋體",Font.PLAIN,12));
seeItem3.setFont(new Font("宋體",Font.PLAIN,12));
/**
* 幫助欄
*/
help1 = new JMenuItem("幫助主題(H)");
help2 = new JMenuItem("關於計算器(A)");
help1.setFont(new Font("宋體",Font.PLAIN,12));
help2.setFont(new Font("宋體",Font.PLAIN,12));
bgb = new ButtonGroup();//選項組
menu1.add(editItem1);
menu1.add(editItem2);
menu2.add(seeItem1);
menu2.add(seeItem2);
menu2.addSeparator();//添加一條分割線
menu2.add(seeItem3);
menu3.add(help1);
menu3.addSeparator();//添加一條分割線
menu3.add(help2);
myBar.add(menu1);
myBar.add(menu2);
myBar.add(menu3);
this.setJMenuBar(myBar);
numActionListener = new Num();//實現數字監聽
/**
* 文本域,即為計算器的屏幕顯示區域
*/
tf = new JTextField();
tf.setEditable(false);//文本區域不可編輯
tf.setBackground(Color.white);//文本區域的背景色
tf.setHorizontalAlignment(JTextField.RIGHT);//文字右對齊
tf.setText("0");
tf.setBorder(BorderFactory.createLoweredBevelBorder());
init();//對計算器進行初始化
}
/**
* 初始化操作
* 添加按鈕
*/
private void init(){
addButton(panel1, "Backspace", new Clear(), Color.red);
addButton(panel1, "CE", new Clear(), Color.red);
addButton(panel1, "C", new Clear(), Color.red);
addButton(panel2, "1/x", new Signs(), Color.magenta);
addButton(panel2, "log", new Signs(), Color.magenta);
addButton(panel2, "7", numActionListener, Color.blue);
addButton(panel2, "8", numActionListener, Color.blue);
addButton(panel2, "9", numActionListener, Color.blue);
addButton(panel2, "÷", new Signs(), Color.red);
addButton(panel2, "n!", new Signs(), Color.magenta);
addButton(panel2, "sqrt", new Signs(), Color.magenta);
addButton(panel2, "4", numActionListener, Color.blue);
addButton(panel2, "5", numActionListener, Color.blue);
addButton(panel2, "6", numActionListener, Color.blue);
addButton(panel2, "×", new Signs(), Color.red);
addButton(panel2, "sin", new Signs(), Color.magenta);
addButton(panel2, "x^2", new Signs(), Color.magenta);
addButton(panel2, "1", numActionListener, Color.blue);
addButton(panel2, "2", numActionListener, Color.blue);
addButton(panel2, "3", numActionListener, Color.blue);
addButton(panel2, "-", new Signs(), Color.red);
addButton(panel2, "cos", new Signs(), Color.magenta);
addButton(panel2, "x^3", new Signs(), Color.magenta);
addButton(panel2, "0", numActionListener, Color.blue);
addButton(panel2, "-/+", new Clear(), Color.blue);
addButton(panel2, ".", new Dot(), Color.blue);
addButton(panel2, "+", new Signs(), Color.red);
addButton(panel2, "tan", new Signs(), Color.magenta);
addButton(panel2, "%", new Signs(), Color.magenta);
addButton(panel2, "π", numActionListener, Color.orange);
addButton(panel2, "e", numActionListener, Color.orange);
addButton(panel2, "′″", new Signs(), Color.orange);
addButton(panel2, "=", new Signs(), Color.red);
JButton btns = new JButton("計算器");
btns.setBorder(BorderFactory.createLoweredBevelBorder());
btns.setEnabled(false);//按鈕不可操作
btns.setPreferredSize(new Dimension(20, 20));
panel3.add(btns);//加入按鈕
addButton(panel3, "MC", null, Color.red);
addButton(panel3, "MR", null, Color.red);
addButton(panel3, "MS", null, Color.red);
addButton(panel3, "M+", null, Color.red);
panel4.add(panel1, BorderLayout.NORTH);
panel4.add(panel2, BorderLayout.CENTER);
this.add(tf, BorderLayout.NORTH);
this.add(panel3, BorderLayout.WEST);
this.add(panel4);
pack();
this.setResizable(false);//窗口不可改變大小
this.setLocation(300, 200);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
/**
* 統一設置按鈕的的使用方式
* @param panel
* @param name
* @param action
* @param color
*/
private void addButton(JPanel panel, String name, ActionListener action, Color color){
JButton bt = new JButton(name);
panel.add(bt);//在面板上增加按鈕
bt.setForeground(color);//設置前景(字體)顏色
bt.addActionListener(action);//增加監聽事件
}
/**
* 計算器的基礎操作(+ - × ÷)
* @param x
*/
private void getResult (double x){
if(oper == "+"){result += x;}
else if(oper == "-"){result -= x;}
else if(oper == "×"){result *= x;}
else if(oper == "÷"){result /= x;}
else if(oper == "="){result = x;}
tf.setText(df.format(result));
}
/**
* 運算符號的事件監聽
*/
class Signs implements ActionListener{
public void actionPerformed(ActionEvent e) {
/*
* 用ActionEvent對象的getActionCommand()方法
* 取得與引發事件對象相關的字元串
*/
String str = e.getActionCommand();
/* sqrt求平方根 */
if(str.equals("sqrt")){
double i = Double.parseDouble(tf.getText());
if(i>=0){
/*
* String.valueOf() 轉換為字元串
* df.format() 按要求保留四位小數
* Math.sqrt() 求算數平方根
*/
tf.setText(String.valueOf(df.format(Math.sqrt(i))));
}
else{
tf.setText("負數不能開平方根");
}
}
/* log求常用對數 */
else if(str.equals("log")){
double i = Double.parseDouble(tf.getText());
if(i>0){
tf.setText(String.valueOf(df.format(Math.log(i))));
}else{
tf.setText("負數不能求對數");
}
}
/* %求百分比 */
else if(str.equals("%")){
tf.setText(df.format(Double.parseDouble(tf.getText()) / 100));
}
/* 1/x求倒數 */
else if(str.equals("1/x")){
if(Double.parseDouble(tf.getText()) == 0){
tf.setText("除數不能為零");
}else{
tf.setText(df.format(1 / Double.parseDouble(tf.getText())));
}
}
/* sin求正弦函數 */
else if(str.equals("sin")){
double i = Double.parseDouble(tf.getText());
tf.setText(String.valueOf(df.format(Math.sin(i))));
}
/* cos求餘弦函數 */
else if(str.equals("cos")){
double i = Double.parseDouble(tf.getText());
tf.setText(String.valueOf(df.format(Math.cos(i))));
}
/* tan求正切函數 */
else if(str.equals("tan")){
double i = Double.parseDouble(tf.getText());
tf.setText(String.valueOf(df.format(Math.tan(i))));
}
/* n!求階乘 */
else if(str.equals("n!")){
double i = Double.parseDouble(tf.getText());
if((i%2==0)||(i%2==1))//判斷為整數放進行階乘操作
{
int j = (int)i;//強制類型轉換
int result=1;
for(int k=1;k<=j;k++)
result *= k;
tf.setText(String.valueOf(result));
}
else
{
tf.setText("無法進行階乘");
}
}
/* x^2求平方 */
else if(str.equals("x^2")){
double i = Double.parseDouble(tf.getText());
tf.setText(String.valueOf(df.format(i*i)));
}
/* x^3求立方 */
else if(str.equals("x^3")){
double i = Double.parseDouble(tf.getText());
tf.setText(String.valueOf(df.format(i*i*i)));
}
/* ′″角度轉換 */
/**
* 將角度值轉換成弧度值,方便三角函數的計算
*/
else if(str.equals("′″")){
double i = Double.parseDouble(tf.getText());
tf.setText(String.valueOf(i/180*Math.PI));
}
else{
if(flag){
IfResult = false;
}
if(IfResult){
oper = str;
}else{
getResult(Double.parseDouble(tf.getText()));
oper = str;
IfResult = true;
}
}
}
}
/**
* 清除按鈕的事件監聽
*/
class Clear implements ActionListener{
public void actionPerformed(ActionEvent e) {
/*
* 用ActionEvent對象的getActionCommand()方法
* 取得與引發事件對象相關的字元串
*/
String str = e.getActionCommand();
if(str == "C"){
tf.setText("0");
IfResult = true;
result = 0;
}else if(str == "-/+"){
double i = 0 - Double.parseDouble(tf.getText().trim());
tf.setText(df.format(i));
}else if(str == "Backspace"){
if(Double.parseDouble(tf.getText()) > 0){
if(tf.getText().length() > 1){
tf.setText(tf.getText().substring(0, tf.getText().length() - 1));
//使用退格刪除最後一位字元
}else{
tf.setText("0");
IfResult = true;
}
}else{
if(tf.getText().length() > 2){
tf.setText(tf.getText().substring(0, tf.getText().length() - 1));
}else{
tf.setText("0");
IfResult = true;
}
}
}else if(str == "CE"){
tf.setText("0");
IfResult = true;
}
}
}
/**
* 數字輸入的事件監聽
*/
class Num implements ActionListener{
public void actionPerformed(ActionEvent e) {
String str = e.getActionCommand();
if(IfResult){
tf.setText("");
IfResult = false;
}
if(str=="π")
{
tf.setText(String.valueOf(Math.PI));
}
else if(str=="e")
{
tf.setText(String.valueOf(Math.E));
}
else{
tf.setText(tf.getText().trim() + str);
if(tf.getText().equals("0")){
tf.setText("0");
IfResult = true;
flag = true;
}
}
}
}
/**
* 小數點的事件監聽
*/
class Dot implements ActionListener{
public void actionPerformed(ActionEvent e) {
IfResult = false;
if(tf.getText().trim().indexOf(".") == -1){
tf.setText(tf.getText() + ".");
}
}
}
/**
* main方法
*/
public static void main(String[] args) {
new Calcutor().setVisible(true);
}
}