求用C語言編寫一簡單計(jì)算器程序，要求:實(shí)現(xiàn)簡單地加減乘除就行了

#include?stdio.h

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int?jisuan(int?a,int?b,char?fu)

{

if(fu=='+')?return?a+b;

if(fu=='-')?return?a-b;

if(fu=='*')?return?a*b;

if(fu=='/')?return?a/b;

}

int?fun(char?*ss,int?n)

{

int?i,flag=0;

if(n==1)?return?ss[0]-'0';

for(i=0;in;i++)

{

if((ss[i]=='+')||(ss[i]=='-'))//掃描加減號

{

flag?=?1;

return?jisuan(fun(ss,i),fun(ss+i+1,n-i-1),ss[i]);

}

}

if(flag==0)//如果算數(shù)中沒有+-

{

for(i=0;in;i++)

if((ss[i]=='*')||(ss[i]=='/'))

{

return?jisuan(fun(ss,i),fun(ss+i+1,n-i-1),ss[i]);

}

}

}

void?main(void)

{

char?s[50];

int?n;

printf("輸入算數(shù):");

scanf("%s",s);

n?=?strlen(s);

printf("=%d\r\n",fun(s,n));

}

用的遞歸，這樣省去很多麻煩

C語言簡單計(jì)算器，支持加減乘除乘方運(yùn)算，每步要有注釋，求助C語言高手解決，謝謝！

//注意，沒有考慮*/和+-的優(yōu)先級。

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class Calculator3 extends JFrame implements ActionListener {

private boolean dotExist, operated, equaled; // 幫助運(yùn)算的布爾變量

private double storedNumber; // 目前的結(jié)果

private char lastOperator; // 表示上一運(yùn)算符

private JTextField operation; // 結(jié)果欄

private JButton dot, plus, minus, multi, div, sqrt, equal, changePN, clear; // 運(yùn)算符

private JButton[] numbers; // 數(shù)字

// 構(gòu)造者

public Calculator3() {

setTitle("Calculator");

// 初始化變量

dotExist = false; // 表示當(dāng)前的數(shù)是否有小數(shù)點(diǎn)

operated = false; // 表示任意運(yùn)算符是否被按下

equaled = false; // 表示等號是否被按下

storedNumber = 0;

lastOperator = '?';

// 初始化窗口變量

operation = new JTextField("0");

operation.setEditable(false);

numbers = new JButton[10];

for (int i = 0; i 10; i++)

numbers[i] = new JButton("" + i);

dot = new JButton(".");

plus = new JButton("+");

minus = new JButton("-");

multi = new JButton("*");

div = new JButton("/");

sqrt = new JButton("√");

equal = new JButton("=");

changePN = new JButton("±");

clear = new JButton("AC");

// 將窗口物體放入窗口

GridBagLayout layout = new GridBagLayout();

getContentPane().setLayout(layout);

addComponent(layout, operation, 0, 0, 4, 1);

addComponent(layout, numbers[1], 1, 0, 1, 1);

addComponent(layout, numbers[2], 1, 1, 1, 1);

addComponent(layout, numbers[3], 1, 2, 1, 1);

addComponent(layout, numbers[4], 2, 0, 1, 1);

addComponent(layout, numbers[5], 2, 1, 1, 1);

addComponent(layout, numbers[6], 2, 2, 1, 1);

addComponent(layout, numbers[7], 3, 0, 1, 1);

addComponent(layout, numbers[8], 3, 1, 1, 1);

addComponent(layout, numbers[9], 3, 2, 1, 1);

addComponent(layout, dot, 4, 0, 1, 1);

addComponent(layout, numbers[0], 4, 1, 1, 1);

addComponent(layout, sqrt, 4, 2, 1, 1);

addComponent(layout, plus, 1, 3, 1, 1);

addComponent(layout, minus, 2, 3, 1, 1);

addComponent(layout, multi, 3, 3, 1, 1);

addComponent(layout, div, 4, 3, 1, 1);

addComponent(layout, equal, 5, 0, 2, 1);

addComponent(layout, changePN, 5, 2, 1, 1);

addComponent(layout, clear, 5, 3, 1, 1);

}

// 對按鈕進(jìn)行反應(yīng)的方法

public void actionPerformed(ActionEvent e) {

JButton btn = (JButton) e.getSource();

if (btn == clear) {

operation.setText("0");

dotExist = false;

storedNumber = 0;

lastOperator = '?';

} else if (btn == equal) {

operate('=');

equaled = true;

} else if (btn == plus) {

operate('+');

equaled = false;

} else if (btn == minus) {

operate('-');

equaled = false;

} else if (btn == multi) {

operate('*');

equaled = false;

} else if (btn == div) {

operate('/');

equaled = false;

} else if (btn == changePN) {

operate('p');

operate('=');

equaled = true;

} else if (btn == sqrt) {

operate('s');

operate('=');

equaled = true;

} else {

if (equaled)

storedNumber = 0;

for (int i = 0; i 10; i++)

if (btn == numbers[i]) {

if (operation.getText().equals("0"))

operation.setText("" + i);

else if (!operated)

operation.setText(operation.getText() + i);

else {

operation.setText("" + i);

operated = false;

}

}

if (btn == dot !dotExist) {

operation.setText(operation.getText() + ".");

dotExist = true;

}

}

}

// 進(jìn)行運(yùn)算的方法

private void operate(char operator) {

double currentNumber = Double.valueOf(operation.getText())

.doubleValue();

if (lastOperator == '?')

storedNumber = currentNumber;

else if (lastOperator == '+')

storedNumber += currentNumber;

else if (lastOperator == '-')

storedNumber -= currentNumber;

else if (lastOperator == '*')

storedNumber *= currentNumber;

else if (lastOperator == '/')

storedNumber /= currentNumber;

else if (lastOperator == 'p')

storedNumber *= -1;

else if (lastOperator == 's')

storedNumber = Math.sqrt(currentNumber);

else if (lastOperator == '=' equaled)

storedNumber = currentNumber;

operation.setText("" + storedNumber);

operated = true;

lastOperator = operator;

}

// 快捷使用GridBagLayout的方法

private void addComponent(GridBagLayout layout, Component component,

int row, int col, int width, int height) {

GridBagConstraints constraints = new GridBagConstraints();

constraints.fill = GridBagConstraints.BOTH;

constraints.insets = new Insets(10, 2, 10, 2);

constraints.weightx = 100;

constraints.weighty = 100;

constraints.gridx = col;

constraints.gridy = row;

constraints.gridwidth = width;

constraints.gridheight = height;

layout.setConstraints(component, constraints);

if (component instanceof JButton)

((JButton) component).addActionListener(this);

getContentPane().add(component);

}

// 主方法初始化并顯示窗口

public static void main(String[] args) {

Calculator3 calc = new Calculator3();

calc.setSize(290, 400);

calc.setVisible(true);

}

}

怎樣用C語言編寫一個(gè)簡單的可以進(jìn)行加減乘除運(yùn)算混合運(yùn)算的計(jì)算器？

用C語言編寫一個(gè)簡單的可以進(jìn)行加減乘除運(yùn)算混合運(yùn)算的計(jì)算器的方法：

1、打開visual C++ 6.0-文件-新建-文件-C++ Source File；

2、輸入預(yù)處理命令和主函數(shù)：

#includestdio.h /*函數(shù)頭：輸入輸出頭文件*/

void main()/*空類型：主函數(shù)*/

3、定義變量：

int a,b,d； /*定義變量的數(shù)據(jù)類型為整型*/

char c；/*定義變量的數(shù)據(jù)類型為字符型*/

4、輸入四則運(yùn)算式：

printf("輸入如“3*4”或“5+2”的四則運(yùn)算式：")；/*輸出文字提示*/

scanf("%d%c%d",a,c,b)；/*輸入四則運(yùn)算式*/

5、判斷運(yùn)算符號：

switch(c) /*判斷運(yùn)算符號*/

{

case'+':d=a+b;break；/*進(jìn)行加法運(yùn)算*/

case'-':d=a-b;break；/*進(jìn)行減法運(yùn)算*/

case'*':d=a*b;break；/*進(jìn)行乘法運(yùn)算*/

case'/':d=a/b;break； /*進(jìn)行除法運(yùn)算*/

}

6、輸出結(jié)果：

printf("%d%c%d=%d\n",a,c,b,d)；/*輸出結(jié)果*/

完整的源代碼：

#includestdio.h /*函數(shù)頭：輸入輸出頭文件*/

void main()/*空類型：主函數(shù)*/

{

int a,b,d；/*定義變量的數(shù)據(jù)類型為整型*/

char c；/*定義變量的數(shù)據(jù)類型為字符型*/

printf("輸入如“3*4”或“5+2”的四則運(yùn)算式：")；/*輸出文字提示*/

scanf("%d%c%d",a,c,b)；/*輸入四則運(yùn)算式*/

switch(c)/*判斷運(yùn)算符號*/

{

case'+':d=a+b;break；/*進(jìn)行加法運(yùn)算*/

case'-':d=a-b;break；/*進(jìn)行減法運(yùn)算*/

case'*':d=a*b;break；/*進(jìn)行乘法運(yùn)算*/

case'/':d=a/b;break；/*進(jìn)行除法運(yùn)算*/

}

printf("%d%c%d=%d\n",a,c,b,d)；/*輸出結(jié)果*/

}