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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.

Ricardo Vethencourt
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1 Answers1

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1/2 does integer division, its result is 0, change either or both operand to double, e.g:

1.0/2
Yu Hao
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