用Java打印双号System.out.printf [英] Print double number System.out.printf in Java

问题描述

我有一个双号，我想只打印这个号码的组成部分。我试图使用 System.out.printf 打印它，但我有一个 IllegalFormatConversionException 。我尝试过这样的事情：

I have a double number and i want to print only the integral part of this number. I was trying to print it using System.out.printf but i i got an IllegalFormatConversionException. I tried something like:

A()
{ 
    double x;
    //calculate double
    System.out.println("%d",x);
}

我知道我可以使用系统打印它.out.print 但也会打印小数部分。我怎么能用 printf ？

I know that i can simply print it using System.out.print but that will print the decimal part too. How can i do this using printf?

推荐答案

System.out.printf("%.0f",x);

• .0 指定精度。根据此处指定的精度舍入数字。 （例如，如果你想要2个小数位，你会指定0.2）


• f 指定它是一个浮点 - 包括双精度数（d代表十进制整数）


• The .0 specifies the precision. Number is rounded off according to the precision specified here. (e.g. if you want 2 decimal places you would specify 0.2)
• The f specifies it's a floating point - including doubles (d is for decimal integer)

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