Java 输出分数作为十进制程序
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/15675809/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Java output fraction as a decimal program
提问by user1858350
I am supposed to create a program that takes a numerator and denominator value from the user then outputs the decimal value of that fraction. However, when I enter the values my output is 0.000000. Here's my code:
我应该创建一个程序，该程序从用户那里获取分子和分母值，然后输出该分数的十进制值。但是，当我输入值时，我的输出是 0.000000。这是我的代码：
import java.util.Scanner;
import java.util.Random;
public class fraction
{
public static void main ( String [] args )
{
int num;
int den;
double result;
num = getNum();
den = getDen();
result = getResult(num, den);
printResult(num, den, result);
}
public static int getNum()
{
Scanner input = new Scanner (System.in);
int num;
System.out.print("Please enter the numerator: ");
num = input.nextInt();
return num;
}
public static int getDen()
{
Scanner input = new Scanner (System.in);
int den;
System.out.print("Please enter the denominator: ");
den = input.nextInt();
return den;
}
public static double getResult(int num, int den)
{
double result;
result = num / den;
return result;
}
public static void printResult(int num, int den, double result)
{
System.out.printf("The fraction %d / %d in decimal form is %f\n", num, den, result);
}}
回答by SteeveDroz
That's because 1 / 2is equal to 0, not 0.5 when you use ints. Try casting your ints into doubles either with (double) num / denor with 1.0 * num / den.
那是因为1 / 2当您使用ints时，它等于 0，而不是 0.5 。尝试将您的整数转换为doubles(double) num / den或 with 1.0 * num / den。
回答by Sudhanshu Umalkar
This should do -
这应该做 -
result = (double) num / den;
Else, the result of int / int would be int without fractional part.
否则， int / int 的结果将是没有小数部分的 int 。
