小编csc*_*_12的帖子

在Xcode 6中创建.xib文件的复选框似乎被禁用.我找不到任何方法再次启用它.有人知道这是否可行？

如果输入的数字超过12位,我无法弄清楚为什么这个算法进入无限循环.谁能明白为什么永远不会结束？谢谢.我刚刚更新了算法以使用fabs()函数并仍然获得无限循环.

double squareroot(double x)

{ /* computes the square root of x */

/* make sure x is not negative .. no math crimes allowed! */
assert( x >= 0 );
if (x==0) return 0;

/* the sqrt must be between xhi and xlo */
double xhi = x;
double xlo = 0;
double guess = x/2;

/* We stop when guess*guess-x is very small */

while (abs(guess*guess-x) > 0.00001 )
{
    if (guess*guess > x){
        xhi = guess;
    } …