个人作业1——四则运算题目生成程序（基于java）

除了整数以外，还要支持真分数的四则运算，真分数的运算，例如：/ + / = /
运算符为 +, −, ×, ÷
并且要求能处理用户的输入，并判断对错，打分统计正确率。
要求能处理用户输入的真分数， 如 /, / 等
使用 -n 参数控制生成题目的个数，例如执行下面命令将生成10个题目
Myapp.exe -n

public static int commonDivisor(int x, int y) // 计算2个数的最大公约数。按绝对值计算。
{
if (x == 0 || y == 0) {
return 1;
}
int x1;
int y1; x1 = (Math.abs(x) > Math.abs(y)) ? Math.abs(x) : Math.abs(y); // 使x1>y1.
y1 = (Math.abs(x) > Math.abs(y)) ? Math.abs(y) : Math.abs(x);
int z = 1;
while (z != 0) {
z = x1 % y1;
x1 = y1;
y1 = z;
}
return x1;
}

Calculator add(Calculator r) { // 加法运算
int a = r.getNumerator();
int b = r.getDenominator();
int newNumerator = numerator * b + denominator * a;
int newDenominator = denominator * b; int maxCommon = commonDivisor(newNumerator, newDenominator);
Calculator result = new Calculator(newNumerator/ maxCommon, newDenominator/ maxCommon);
return result;
} Calculator sub(Calculator r) { // 减法运算
int a = r.getNumerator();
int b = r.getDenominator();
int newNumerator = numerator * b - denominator * a;
int newDenominator = denominator * b; int maxCommon = commonDivisor(newNumerator, newDenominator);
Calculator result = new Calculator(newNumerator/ maxCommon, newDenominator/ maxCommon);
return result;
} Calculator muti(Calculator r) { // 乘法运算
int a = r.getNumerator();
int b = r.getDenominator();
int newNumerator = numerator * a;
int newDenominator = denominator * b; int maxCommon = commonDivisor(newNumerator, newDenominator);
Calculator result = new Calculator(newNumerator/ maxCommon, newDenominator/ maxCommon);
return result;
} Calculator div(Calculator r) { // 除法运算
int a = r.getNumerator();
int b = r.getDenominator();
int newNumerator = numerator * b;
int newDenominator = denominator * a; int maxCommon = commonDivisor(newNumerator, newDenominator);
Calculator result = new Calculator(newNumerator/ maxCommon, newDenominator/ maxCommon);
return result;
}