问题
I have this little program in C that calculates the square root x of a positive integer N using a recursive function (implemented using a while loop). If I calculate x using this:
x = (1/2)*(x + N/x) //x0 = 1.0
Then x keeps growing to inf and then nan. However if I use this:
x = (x + N/x)/2 //x0 = 1.0
It works fine, why? Thanks.
回答1:
1/2 does integer division, its result is 0, change either or both operand to double, e.g:
1.0/2
来源：https://stackoverflow.com/questions/26643536/trouble-with-float-on-c