add, subtract, multiply, divide, clear
This commit is contained in:
246
calculator.jsp
246
calculator.jsp
@ -1,4 +1,4 @@
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<%@ page contentType="text/html; charset=big5" %>
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<%@ page contentType="text/html; charset=utf-8" %>
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<html>
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<head>
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<title> Calculator </title>
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@ -6,99 +6,161 @@
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<body>
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<p>Calculator</p>
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<%
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String inputdata = request.getParameter("symbol");
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if(inputdata == null) {
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%>
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<form action="calculator.jsp" method=post>
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<p>
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<input name="display">
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<br>
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<input name="symbol" type="submit" value="%">
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<input name="symbol" type="submit" value="root">
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<input name="symbol" type="submit" value="square">
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<input name="symbol" type="submit" value="reciprocal">
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<br>
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<input name="symbol" type="submit" value="CE">
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<input name="symbol" type="submit" value="C">
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<input name="symbol" type="submit" value="X">
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<input name="symbol" type="submit" value="/">
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<br>
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<input name="symbol" type="submit" value="7">
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<input name="symbol" type="submit" value="8">
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<input name="symbol" type="submit" value="9">
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<input name="symbol" type="submit" value="*">
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<br>
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<input name="symbol" type="submit" value="4">
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<input name="symbol" type="submit" value="5">
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<input name="symbol" type="submit" value="6">
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<input name="symbol" type="submit" value="-">
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<br>
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<input name="symbol" type="submit" value="1">
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<input name="symbol" type="submit" value="2">
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<input name="symbol" type="submit" value="3">
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<input name="symbol" type="submit" value="+">
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<br>
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<input name="symbol" type="submit" value="+-">
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<input name="symbol" type="submit" value="0">
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<input name="symbol" type="submit" value=".">
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<input name="symbol" type="submit" value="=">
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</p>
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</form>
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<%
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}
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else {
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try{
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//int data = Integer.parseInt(inputdata);
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out.println(inputdata);
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%>
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<form action="calculator.jsp" method=post>
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<p>
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<input name="display">
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<br>
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<input name="symbol" type="submit" value="%">
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<input name="symbol" type="submit" value="root">
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<input name="symbol" type="submit" value="square">
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<input name="symbol" type="submit" value="reciprocal">
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<br>
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<input name="symbol" type="submit" value="CE">
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<input name="symbol" type="submit" value="C">
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<input name="symbol" type="submit" value="X">
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<input name="symbol" type="submit" value="/">
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<br>
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<input name="symbol" type="submit" value="7">
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<input name="symbol" type="submit" value="8">
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<input name="symbol" type="submit" value="9">
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<input name="symbol" type="submit" value="*">
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<br>
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<input name="symbol" type="submit" value="4">
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<input name="symbol" type="submit" value="5">
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<input name="symbol" type="submit" value="6">
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<input name="symbol" type="submit" value="-">
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<br>
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<input name="symbol" type="submit" value="1">
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<input name="symbol" type="submit" value="2">
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<input name="symbol" type="submit" value="3">
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<input name="symbol" type="submit" value="+">
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<br>
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<input name="symbol" type="submit" value="+-">
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<input name="symbol" type="submit" value="0">
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<input name="symbol" type="submit" value=".">
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<input name="symbol" type="submit" value="=">
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</p>
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</form>
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<%
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<%!
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// 存運算元的值
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float[] number = {0, 0};
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// 在第幾個運算元
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int i = 0;
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// 使用中的運算子
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int oprator = 0;
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// 加法
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void add() {
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number[0] += number[1];
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}
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catch(NumberFormatException e) {
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throw new NumberFormatException("您輸入的不是整數");
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}
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// 減法
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void subtract() {
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number[0] -= number[1];
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}
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// 乘法
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void multiply() {
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number[0] *= number[1];
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}
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// 除法
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void divide() {
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number[0] /= number[1];
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}
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// 取餘
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void remainder() {
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number[0] %= number[1];
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}
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//清除
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void clear() {
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number[0] = 0;
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number[1] = 0;
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}
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%>
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<form action="calculator.jsp" method=post>
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<p>
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<input name="symbol" type="submit" value="%">
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<input name="symbol" type="submit" value="root">
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<input name="symbol" type="submit" value="square">
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<input name="symbol" type="submit" value="reciprocal">
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<br>
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<input name="symbol" type="submit" value="CE">
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<input name="symbol" type="submit" value="C">
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<input name="symbol" type="submit" value="X">
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<input name="symbol" type="submit" value="/">
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<br>
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<input name="symbol" type="submit" value="7">
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<input name="symbol" type="submit" value="8">
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<input name="symbol" type="submit" value="9">
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<input name="symbol" type="submit" value="*">
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<br>
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<input name="symbol" type="submit" value="4">
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<input name="symbol" type="submit" value="5">
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<input name="symbol" type="submit" value="6">
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<input name="symbol" type="submit" value="-">
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<br>
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<input name="symbol" type="submit" value="1">
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<input name="symbol" type="submit" value="2">
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<input name="symbol" type="submit" value="3">
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<input name="symbol" type="submit" value="+">
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<br>
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<input name="symbol" type="submit" value="+-">
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<input name="symbol" type="submit" value="0">
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<input name="symbol" type="submit" value=".">
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<input name="symbol" type="submit" value="=">
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</p>
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</form>
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}
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<%
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// 輸入的字元
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try {
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String inputdata = request.getParameter("symbol");
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if(inputdata == null) {
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inputdata = "0";
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}
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if (inputdata.equals("CE")) {
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clear();
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}
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// 如果是數字就累積輸入
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else if (inputdata.equals("0") ||
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inputdata.equals("1") ||
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inputdata.equals("2") ||
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inputdata.equals("3") ||
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inputdata.equals("4") ||
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inputdata.equals("5") ||
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inputdata.equals("6") ||
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inputdata.equals("7") ||
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inputdata.equals("8") ||
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inputdata.equals("9")) {
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// 輸入多位數字
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number[i] *= 10;
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number[i] += Float.parseFloat(inputdata);
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}
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else {
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// 如果有選擇的運算子
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if (oprator != 0) {
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switch (oprator) {
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case 1:
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add();
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break;
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case 2:
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subtract();
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break;
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case 3:
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multiply();
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break;
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case 4:
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divide();
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break;
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case 5:
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remainder();
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break;
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}
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}
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if (inputdata.equals("=")) {
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// 清除運算子
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oprator = 0;
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// 回到第一個運算元
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i = 0;
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number[1] = 0;
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}
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else {
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// 回到第二個運算元
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i = 1;
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number[1] = 0;
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// 把運算
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if (inputdata.equals("+")) {
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oprator = 1;
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}
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else if (inputdata.equals("-")) {
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oprator = 2;
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}
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else if (inputdata.equals("*")) {
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oprator = 3;
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}
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else if (inputdata.equals("/")) {
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oprator = 4;
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}
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else if (inputdata.equals("%")) {
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oprator = 5;
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}
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}
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}
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// 印出現在的數字
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out.println(number[i]);
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}
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catch (NumberFormatException e) {
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// 錯誤訊息
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throw new NumberFormatException("您輸入的不是整數");
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}
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%>
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</body>
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</html>
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