Java:Double Datatype Value Doesn't Give Exact Answer -

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this question has answer here:

i'm finding logarithm of value 1 equal 0 not 0.0. when user enter point values give exact answer. problem value not consist in points give answer of value in points.i try parsing , typecasting nothing happen.is there function in java can stop this.
code.

public class new {  public static void main(string[] args) { scanner s = new scanner(system.in); double num = 0; double result; system.out.print("value:"); num = s.nextdouble(); result = math.log(num);  system.out.print("answer:"+result); }  }

compiler output:

value:1 answer:0.0

the 0.0 how double value representing 0 printed default. also, math.log method returns double. 0.0 equal number 0. logarithm, positive base, of 1 0.

if you'd not print decimal point if result integer, test if it's integer.

if (result == (int) result) {     system.out.println((int) result); } else {     system.out.println(result); }

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