在不使用 Math.abs() 的情况下查找数字的绝对值 [英] Finding absolute value of a number without using Math.abs()

问题描述

有没有什么办法可以不用java中的Math.abs()方法来求一个数的绝对值.

Is there any way to find the absolute value of a number without using the Math.abs() method in java.

推荐答案

如果您查看 Math.abs，您可能会找到最佳答案:

If you look inside Math.abs you can probably find the best answer:

例如，对于浮点数:

    /*
     * Returns the absolute value of a {@code float} value.
     * If the argument is not negative, the argument is returned.
     * If the argument is negative, the negation of the argument is returned.
     * Special cases:
     * <ul><li>If the argument is positive zero or negative zero, the
     * result is positive zero.
     * <li>If the argument is infinite, the result is positive infinity.
     * <li>If the argument is NaN, the result is NaN.</ul>
     * In other words, the result is the same as the value of the expression:
     * <p>{@code Float.intBitsToFloat(0x7fffffff & Float.floatToIntBits(a))}
     *
     * @param   a   the argument whose absolute value is to be determined
     * @return  the absolute value of the argument.
     */
    public static float abs(float a) {
        return (a <= 0.0F) ? 0.0F - a : a;
    }

这篇关于在不使用 Math.abs() 的情况下查找数字的绝对值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！