把屏幕调黄 亮度低一点就能护眼了

神舟战神

lisp 已死 lisp 万岁

public class HelloWorld{
public static void main(String[] args){
System.out.println("Hello World!");
}
}

实在不行就换 Linux 或 mac 吧

(define (abs x)
(cond ((> x 0) x)
((= x 0) 0)
((< x 0) (* -1 x))))
(define (square x) (* x x))
(define (cube x) (* x x x))
(define (good-enough? guess x)
(< (abs (- (cube guess) x)) 0.001))
(define (improve guess x)
(/ (+ (/ x (square guess)) (* 2 guess)) 3))
(define (cube-root-iter guess x)
(if (good-enough? guess x)
guess
(cube-root-iter (improve guess x) x)))
(define (cube-root x)
(cube-root-iter 1.0 x))
牛顿法求立方根，迭代公式 x1=(x0/n^2+2*n)/3
(手动滑稽~)

建议区号+110

@cjw6 +1

sicp