java算术测试代码 java的计算器代码

用Java设计一个小学算术运算测试软件

你的想法是好的，但是我仔细构思了一遍，太难了。

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首先难点就是怎么生成题目。也是最难得，因为有太多不确定，弄不好就会出现负数结果的题目。

然后是题目的解答，这个难点就不说了，这个我在几年前就写好了。一直没用上，现在却用上了。

还有，你要窗体，可是我不会用swing

还有你要的四则混合运算是多长的，我总不能写一个有1000多个数字写成的式子吧。

题目中是否涉及到小数

下面是我的计算代码：

package compute;

public class CaculateString {

private String str, s;

private int p1, p2;

public CaculateString(String str) {

this.str = str;

this.clear();

this.check();

}

public String caculate() {

while (isEnd(str)) {

p2 = str.indexOf(")");

if (p2 != -1) {

s = str.substring(0, p2);

p1 = s.lastIndexOf("(");

s = str.substring(p1 + 1, p2);

if (!s.equals("")) {

s = this.caculateNumber(s);

if (p2 == (str.length() - 1))

str = str.substring(0, p1) + s;

else

str = str.substring(0, p1) + s + str.substring(p2 + 1);

} else {

str = str.substring(0, p1) + str.substring(p2 + 1);

}

} else

str = this.caculateNumber(str);

}

return str;

}

private String caculateNumber(String ss) {

int p3 = 0, p4 = 0, p5 = 0;

char b = ' ', c = ' ';

String s1 = null, s2 = null;

double d1 = 0.0, d2 = 0.0, d3 = 0.0;

if (ss.charAt(0) == '+') {

ss = ss.substring(1);

if (ss.indexOf("+") == -1 ss.indexOf("-") == -1

ss.indexOf("*") == -1 ss.indexOf("/") == -1)

return ss;

} else if (ss.charAt(0) == '-') {

if (ss.indexOf("+", 1) == -1 ss.indexOf("-", 1) == -1

ss.indexOf("*", 1) == -1 ss.indexOf("/", 1) == -1)

return ss;

}

while (isEnd2(ss)) {

p3 = 0;

p4 = 0;

p5 = 0;

if (ss.indexOf("*") == -1 ss.indexOf("/") == -1) {

for (int i = 0; i ss.length(); i++) {

b = ss.charAt(i);

if (b == '+' || b == '-') {

if (p3 == 0 i != 0) {

p3 = i;

c = b;

} else if (p3 != 0 i != (p3 + 1)) {

p4 = i;

break;

}

}

}

if (p4 == 0) {

s1 = ss.substring(0, p3);

s2 = ss.substring(p3 + 1);

} else {

s1 = ss.substring(0, p3);

s2 = ss.substring(p3 + 1, p4);

}

d1 = Double.parseDouble(s1);

d2 = Double.parseDouble(s2);

if (c == '+')

d3 = d1 + d2;

else if (c == '-')

d3 = d1 - d2;

if (p4 == 0)

ss = new Double(d3).toString();

else

ss = new Double(d3).toString() + ss.substring(p4);

} else {

if (ss.indexOf("*") == -1) {

c = '/';

p4 = ss.indexOf("/");

} else if (ss.indexOf("/") == -1) {

c = '*';

p4 = ss.indexOf("*");

} else if (ss.indexOf("*") ss.indexOf("/")) {

c = '/';

p4 = ss.indexOf("/");

} else if (ss.indexOf("*") ss.indexOf("/")) {

c = '*';

p4 = ss.indexOf("*");

}

for (int i = p4 - 1; i = 0; i--) {

b = ss.charAt(i);

if (b == '+' || b == '-') {

if ((i - 1) != 0 ss.charAt(i - 1) != '+'

ss.charAt(i - 1) != '-') {

p3 = i;

break;

} else if ((i - 1) != 0

(ss.charAt(i - 1) == '+' || ss.charAt(i - 1) == '-')) {

p3 = i - 1;

break;

}

}

}

for (int i = p4 + 1; i ss.length(); i++) {

b = ss.charAt(i);

if ((b == '+' || b == '-' || b == '*' || b == '/')

(i - 1) != p4) {

p5 = i;

break;

}

}

if (p3 == 0)

s1 = ss.substring(0, p4);

else

s1 = ss.substring(p3 + 1, p4);

if (p5 == 0)

s2 = ss.substring(p4 + 1);

else

s2 = ss.substring(p4 + 1, p5);

d1 = Double.parseDouble(s1);

d2 = Double.parseDouble(s2);

if (c == '*')

d3 = d1 * d2;

else if (c == '/')

d3 = d1 / d2;

if (p3 == 0 p5 == 0)

ss = new Double(d3).toString();

else if (p3 == 0 p5 != 0)

ss = new Double(d3).toString() + ss.substring(p5);

else if (p3 != 0 p5 == 0)

ss = ss.substring(0, p3 + 1) + new Double(d3).toString();

else if (p3 != 0 p5 != 0)

ss = ss.substring(0, p3 + 1) + new Double(d3).toString()

+ ss.substring(p5);

}

}

return ss;

}

private boolean isEnd(String str) {

if (str.indexOf("(") != -1 || str.indexOf(")") != -1

|| str.indexOf("+", 1) != -1 || str.indexOf("-", 1) != -1

|| str.indexOf("*", 1) != -1 || str.indexOf("/", 1) != -1)

return true;

return false;

}

private boolean isEnd2(String ss) {

if (ss.indexOf("+", 1) != -1 || ss.indexOf("-", 1) != -1

|| ss.indexOf("*", 1) != -1 || ss.indexOf("/", 1) != -1)

return true;

return false;

}

private void clear() {

str = str.replaceAll(" ", "");

}

private void check() {

int right = 0, left = 0;

for (int i = 0; i str.length(); i++) {

char a = str.charAt(i);

if (a != '0' a != '1' a != '2' a != '3' a != '4'

a != '5' a != '6' a != '7' a != '8' a != '9'

a != '+' a != '-' a != '*' a != '/' a != '('

a != ')' a != '.') {

System.exit(0);

}

if (a == '(')

left++;

else if (a == ')')

right++;

}

if (left != right) {

System.exit(0);

}

}

public static void main(String args[]) {

System.out.println(new CaculateString("((1-(0/3))*7)+8").caculate());

}

}

JAVA 算术运算测试

import java.util.Random;

import java.util.Scanner;

public class TestRandom {

public static void main(String[] args) {

Random rand = new Random();

Scanner input = new Scanner(System.in);

while(true){

int a = rand.nextInt(100);

int b = rand.nextInt(100);

int result = a+b;

System.out.println(a+"+"+b+"=?");

int  yourGuess=input.nextInt(); 

if(yourGuess == result){

System.out.println("you are right");

}else {

System.out.println("you are wrong");

}

}

}

}

用java编写程序 课题：算术运算测试

你好，按照你的要求代码如下，可以直接运行

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class test {

public static void main(String[] args) {

int count = 0;

BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

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

int a = (int) (Math.random() * 100);

int b = (int) (Math.random() * 100);

int c = (int) (Math.random() * 2);

int r = 0;

switch (c) {

case 0:

if (a + b = 100) {

a = 100 - b;

}

System.out.print(a + " + " + b + " = ");

r = a + b;

break;

case 1:

if (a b) {

int t = a;

a = b;

b = t;

}

System.out.print(a + " - " + b + " = ");

r = a - b;

}

int input;

try {

input = Integer.valueOf(in.readLine());

} catch (Exception e1) {

System.out.println("答案错误\n");

continue;

}

if (input == r) {

count++;

System.out.println("答案正确\n");

} else {

System.out.println("答案错误\n");

}

}

if (null != in) {

try {

in.close();

} catch (IOException e) {

e.printStackTrace();

}

}

System.out.println("答对数量：" + count + "\n得分: " + count * 10);

}

}