如何检查一个整数是否是一个完美的正方形 [英] How to check if an integer is a perfect square

问题描述

我如何编写if-then语句来检查输入的整数是否是理想的平方(即，如果我取平方根，那么它也将是整数:4、9、16、25、36等)在DrJava中?谢谢！

How could I write an if-then statement that checks if an inputted integer is a perfect square or not (i.e. if I took the square root, it would be an integer as well: 4, 9, 16, 25, 36, etc.) in DrJava? Thank you!

推荐答案

我知道这个问题已经有了答案....但是以防万一，这也可行.

I am aware that this question already has an answer.... But just in case, this also works.

int x = (int) Math.sqrt(input);
if(Math.pow(x,2) == input)
    //Do stuff

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