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Demo3.java</font>
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<pre><span class="s0">import </span><span class="s1">java.util.Scanner</span><span class="s0">;</span>
<span class="s0">public class </span><span class="s1">Demo3 {</span>
<span class="s0">public static void </span><span class="s1">main(String[]args){</span>
<span class="s1">System.out.println(</span><span class="s2">"**********************************</span><span class="s0">\n</span><span class="s2">" </span><span class="s1">+</span>
<span class="s2">"*******微型计算器*******************</span><span class="s0">\n</span><span class="s2">" </span><span class="s1">+</span>
<span class="s2">"*******1.求和**********************</span><span class="s0">\n</span><span class="s2">" </span><span class="s1">+</span>
<span class="s2">"*******2.求差**********************</span><span class="s0">\n</span><span class="s2">" </span><span class="s1">+</span>
<span class="s2">"*******3.求积**********************</span><span class="s0">\n</span><span class="s2">" </span><span class="s1">+</span>
<span class="s2">"*******4.求商**********************</span><span class="s0">\n</span><span class="s2">" </span><span class="s1">+</span>
<span class="s2">"*******5.求余**********************</span><span class="s0">\n</span><span class="s2">" </span><span class="s1">+</span>
<span class="s2">"*******6.推出**********************</span><span class="s0">\n</span><span class="s2">" </span><span class="s1">+</span>
<span class="s2">"*******选择你想要执行的操作***********"</span><span class="s1">)</span><span class="s0">;</span>
<span class="s1">Scanner in =</span><span class="s0">new </span><span class="s1">Scanner(System.in)</span><span class="s0">;</span>
<span class="s0">int </span><span class="s1">x= in.nextInt()</span><span class="s0">;</span>
<span class="s0">if </span><span class="s1">(x==</span><span class="s3">1</span><span class="s1">){</span>
<span class="s1">System.out.println(</span><span class="s2">"请输入两个数字求和"</span><span class="s1">)</span><span class="s0">;</span>
<span class="s1">Scanner input1= </span><span class="s0">new </span><span class="s1">Scanner(System.in)</span><span class="s0">;</span>
<span class="s0">int </span><span class="s1">a = input1.nextInt()</span><span class="s0">;</span>
<span class="s1">Scanner input2= </span><span class="s0">new </span><span class="s1">Scanner(System.in)</span><span class="s0">;</span>
<span class="s0">int </span><span class="s1">b = input2.nextInt()</span><span class="s0">;</span>
<span class="s1">System.out.println(</span><span class="s2">"和为："</span><span class="s1">+(a+b))</span><span class="s0">;</span>
<span class="s1">}</span>
<span class="s0">else if </span><span class="s1">(x==</span><span class="s3">2</span><span class="s1">){</span>
<span class="s1">System.out.println(</span><span class="s2">"请输入两个数字求差"</span><span class="s1">)</span><span class="s0">;</span>
<span class="s1">Scanner input1= </span><span class="s0">new </span><span class="s1">Scanner(System.in)</span><span class="s0">;</span>
<span class="s0">int </span><span class="s1">a = input1.nextInt()</span><span class="s0">;</span>
<span class="s1">Scanner input2= </span><span class="s0">new </span><span class="s1">Scanner(System.in)</span><span class="s0">;</span>
<span class="s0">int </span><span class="s1">b = input2.nextInt()</span><span class="s0">;</span>
<span class="s1">System.out.println(</span><span class="s2">"差为："</span><span class="s1">+(a-b))</span><span class="s0">;</span>
<span class="s1">}</span>
<span class="s0">else if </span><span class="s1">(x==</span><span class="s3">3</span><span class="s1">){</span>
<span class="s1">System.out.println(</span><span class="s2">"请输入两个数字求积"</span><span class="s1">)</span><span class="s0">;</span>
<span class="s1">Scanner input1= </span><span class="s0">new </span><span class="s1">Scanner(System.in)</span><span class="s0">;</span>
<span class="s0">int </span><span class="s1">a = input1.nextInt()</span><span class="s0">;</span>
<span class="s1">Scanner input2= </span><span class="s0">new </span><span class="s1">Scanner(System.in)</span><span class="s0">;</span>
<span class="s0">int </span><span class="s1">b = input2.nextInt()</span><span class="s0">;</span>
<span class="s1">System.out.println(</span><span class="s2">"积为："</span><span class="s1">+(a*b))</span><span class="s0">;</span>
<span class="s1">}</span>
<span class="s0">else if </span><span class="s1">(x==</span><span class="s3">4</span><span class="s1">){</span>
<span class="s1">System.out.println(</span><span class="s2">"请输入两个数字求商"</span><span class="s1">)</span><span class="s0">;</span>
<span class="s1">Scanner input1= </span><span class="s0">new </span><span class="s1">Scanner(System.in)</span><span class="s0">;</span>
<span class="s0">int </span><span class="s1">a = input1.nextInt()</span><span class="s0">;</span>
<span class="s1">Scanner input2= </span><span class="s0">new </span><span class="s1">Scanner(System.in)</span><span class="s0">;</span>
<span class="s0">int </span><span class="s1">b = input2.nextInt()</span><span class="s0">;</span>
<span class="s1">System.out.println(</span><span class="s2">"商为："</span><span class="s1">+(a/b))</span><span class="s0">;</span>
<span class="s1">}</span>
<span class="s0">else if </span><span class="s1">(x==</span><span class="s3">5</span><span class="s1">){</span>
<span class="s1">System.out.println(</span><span class="s2">"请输入两个数字求余"</span><span class="s1">)</span><span class="s0">;</span>
<span class="s1">Scanner input1= </span><span class="s0">new </span><span class="s1">Scanner(System.in)</span><span class="s0">;</span>
<span class="s0">int </span><span class="s1">a = input1.nextInt()</span><span class="s0">;</span>
<span class="s1">Scanner input2= </span><span class="s0">new </span><span class="s1">Scanner(System.in)</span><span class="s0">;</span>
<span class="s0">int </span><span class="s1">b = input2.nextInt()</span><span class="s0">;</span>
<span class="s1">System.out.println(</span><span class="s2">"余为："</span><span class="s1">+(a%b))</span><span class="s0">;</span>
<span class="s1">}</span>
<span class="s0">else if </span><span class="s1">(x==</span><span class="s3">6</span><span class="s1">){</span>
<span class="s1">System.out.println(</span><span class="s2">"退出程序"</span><span class="s1">)</span><span class="s0">;</span>
<span class="s1">}</span>
<span class="s1">}</span>
<span class="s1">}</span></pre>
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