Java起步——分数四则运算
/*
* 程序的版权和版本声明部分
* Copyright (c) 2011, 烟台大学计算机学院学生
* All rights reserved.
* 文件名称：
* 作 者： 张传新
* 完成日期：2012 年09 月17日
* 版 本 号： J.1.11
* 对任务及求解方法的描述部分
* 输入描述：
* 问题描述：分数运算
* 程序输出：
* 问题分析：……
* 算法设计：……
*/
public class TestFractory {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubfracAdd(1,5,7,20);//结果为：11/20fracSub(1,5,7,20);//分数相减fracMul(1,5,7,20);//分数相乘fractDiv(1,5,7,20);//分数相除}//分数相加static void fracAdd(int first_numerator,int first_denominator,int second_numrator,int second_denominator){//以下代码能够在控制台上显示结果//需要调用求最大公约数的函数//需要调用求最小公倍数的函数int a = lcm(first_denominator,second_denominator);int numerator,denominator;numerator = first_numerator * ( a / first_denominator) + second_numrator * (a / second_denominator);denominator = a;int b = gcd(numerator,denominator);numerator = numerator / b;denominator = denominator / b;System.out.println(numerator+"/"+denominator);}//分数相减static void fracSub(int first_numerator,int first_denominator,int second_numrator,int second_denominator){int a = lcm(first_denominator,second_denominator);int numerator,denominator;numerator = first_numerator * ( a / first_denominator) - second_numrator * (a / second_denominator);denominator = a;int b = gcd(numerator,denominator);numerator = numerator / b;denominator = denominator / b;System.out.println(numerator+"/"+denominator);}//分数相乘static void fracMul(int first_numerator,int first_denominator,int second_numrator,int second_denominator){int numerator,denominator;numerator = first_numerator * second_numrator;denominator = first_denominator * second_denominator;int b = gcd(numerator,denominator);numerator = numerator / b;denominator = denominator / b;System.out.println(numerator+"/"+denominator);}//分数相除static void fractDiv(int first_numerator,int first_denominator,int second_numrator,int second_denominator){int numerator,denominator;numerator = first_numerator * second_denominator;denominator = first_denominator * second_numrator;int b = gcd(numerator,denominator);numerator = numerator / b;denominator = denominator / b;System.out.println(numerator+"/"+denominator);}//判断数的大小static int min(int m,int n){if(m > n){ return n;}else{ return m;}}//最大公约数static int gcd(int m,int n){ min(m,n);int s = 1;for(int i = 2;i <= min(m,n);i ++){for(int j = 2;j <= i;j++){ if(m % j == 0 && n % j == 0){ m = m / j; n = n / j; s = s * j; }}}return s;}//最小公倍数static int lcm(int m,int n){ int b = gcd(m,n) * (m / gcd(m,n)) * (n / gcd(m,n));return b;}}
运行结果：
11/20
-3/20
7/100
4/7
经验积累：
最近学习很松懈，自己越来越懒了。。。。只能期待自己快找回状态。。。
其实Java并不难，只是学没学的问题，现在很多不会，是因为没学，学了就会了。
我决定了一个月内读完《Java2实用教程》，拼了！！！！！