递归练习之 给出任意浮点数, 找出将小数部分变为整数最小整数值

/*********************************************************************************  
 Copyright (C), 1988-1999, drvivermonkey. Co., Ltd.  
 File name:   
 Author: Driver Monkey  
 Version:   
 Mail:bookworepeng@hotmail.com  qq:196568501
 Date: 2014.04.02  
 Description:   递归练习之 给出任意浮点数, 找出将小数部分变为整数最小整数值
 *********************************************************************************/  

#include <iostream>
#include <sstream>
#include <fstream>
#include <iostream>
#include <iomanip>
#include <string>
#include <memory.h>
#include <thread> 
#include <stdlib.h>    
#include <math.h>

using namespace std;

static int  fuction(double x, int guess, double pricision);

int main()
{
    double x = 1.5;
    double y = fuction(x,2,0.0001);

    cout<<"fuction = " <<y<<endl;
    cout<<"x * y = "<<x*y<<endl;
    
    return 0;
}

static int  fuction(double x, int guess, double pricision)
{
    double y = x * guess;
    double y_int_part = round(y);//取整数部分
    double y_fractional_part = y - y_int_part; //取小数部分
    
    if(fabs(y_fractional_part) <= pricision)
    {
       return guess;
    }
    
    int new_guess = guess + 2;//小数变成整数的最小步进是 2

   fuction(x, new_guess, pricision);
}

递归练习之 给出任意浮点数, 找出将小数部分变为整数最小整数值

原文：http://blog.csdn.net/drivermonkey/article/details/41592797