作业
package CSniu;
import java.util.Random;
import java.util.Scanner;
public class A1
{
public static void main(String[] args)
{
A1 a = new A1();
System.out.print("请输入答题次数：");
Scanner w = new Scanner(System.in);
int s = w.nextInt();
System.out.println("一共" + s + "道题，" + "答题完毕后自动统计正确率");
int zq = 0;
int cw = 0;
for (int i = 0; i < s; i++)
{
System.out.print("请输入需要的运算符：");
Scanner input = new Scanner(System.in);
String x = input.next();
int a1 = new Random().nextInt(10) + 1;
int a2 = new Random().nextInt(10) + 1;
switch (x)
{
case "+":
int sum1 = a1 + a2;
System.out.print(a1 + "+" + a2 + "=");
Scanner k1 = new Scanner(System.in);
int q1;
while (true)
{
try
{
q1 = k1.nextInt();
break;
}
catch (Exception e)
{
System.out.println("請輸入一個整數。");
}
}
if (q1 == sum1)
{
System.out.println("答案正确");
zq = zq + 1;
}
else
{
System.out.println("答案错误");
cw = cw + 1;
}
break;
case "-":
int sum2 = a1 - a2;
if (a1 < a2)
{
int sum3 = a2 - a1;
System.out.print("请输入 " + a2 + "-" + a1 + " 的正确答案：");
int q2;
while (true)
{
try
{
Scanner scanner = new Scanner(System.in);
q2 = scanner.nextInt();
break;
}
catch (Exception e)
{
System.out.println("請輸入一個整數。");
}
}
if (q2 == sum3)
{
System.out.println("答案正确");
zq = zq + 1;
}
else
{
System.out.println("答案错误");
cw = cw + 1;
}
break;
}
System.out.print(a1 + "-" + a2 + "=");
Scanner k2 = new Scanner(System.in);
int q2;
while (true)
{
try
{
q2 = k2.nextInt();
break;
}
catch (Exception e)
{
System.out.println("請輸入一個整數。");
}
}
if (q2 == sum2)
{
System.out.println("答案正确");
zq = zq + 1;
}
else
{
System.out.println("答案错误");
cw = cw + 1;
}
break;
case "*":
int sum3 = a1 * a2;
System.out.print(a1 + "*" + a2 + "=");
Scanner k3 = new Scanner(System.in);
int q3;
while (true)
{
try
{
q3 = k3.nextInt();
break;
}
catch (Exception e)
{
System.out.println("請輸入一個整數。");
}
}
if (q3 == sum3)
{
System.out.println("答案正确");
cw = cw + 1;
zq = zq + 1;
}
else
{
System.out.println("答案错误");
cw = cw + 1;
}
break;
case "/":
if (a1 == 0)
{
int sum4 = a2 / a1;
System.out.print(a2 + "/" + a1 + "=");
Scanner k4 = new Scanner(System.in);
int q4;
while (true)
{
try
{
q4 = k4.nextInt();
break;
}
catch (Exception e)
{
System.out.println("請輸入一個整數。");
}
}
if (q4 == sum4)
{
System.out.println("答案正确");
zq = zq + 1;
}
else
{
System.out.println("答案错误");
cw = cw + 1;
}
break;
}
int sum4 = a1 / a2;
System.out.print(a1 + "/" + a2 + "=");
Scanner k4 = new Scanner(System.in);
int q4;
while (true)
{
try
{
q4 = k4.nextInt();
break;
}
catch (Exception e)
{
System.out.println("請輸入一個整數。");
}
}
if (q4 == sum4)
{
System.out.println("答案正确");
zq = zq + 1;
}
else
{
System.out.println("答案错误");
cw = cw + 1;
}
break;
}
}
System.out.println("答题结束,一共" + s + "道题，" + "正确" + zq + "个，错误" + cw + "个。");
}
}
1，判断用户输入
2，减法不允许出现负数结果
3，除法不允许被除数为0
和邢博结对作业。
