CODEWITHSUNDEEP
javalogicconditional-statements
user2829091
user2829091

Reputation: 1

Conditional Statement Returning False

Why does this statement return false? When I calculate it by hand I get 114 = 114 which should be true: 

System.out.println(114 == (114.0 / Math.PI * Math.PI));

Upvotes: 0

Views: 60

Answers (3)

santu
santu

Reputation: 685

Because 

System.out.println(114.0 / Math.PI * Math.PI);

will print

114.00000000000001

You can try

System.out.println(114 == (int)(114.0 / Math.PI * Math.PI));

(converting the float to int)This will return true...

Upvotes: 0

Masudul
Masudul

Reputation: 21961

Try with following code:

double res=114.0 / Math.PI * Math.PI;
System.out.println(res);

Result is: 114.00000000000001 not 114.

Upvotes: 1

tbodt
tbodt

Reputation: 16987

That's because by using Math.PI you introduce floating point arithmetic, which is not as precise as actual integer arithmetic. The result of the right side will in fact 114.00000000000001, a value that is very very very close to 114, but not exactly.

Upvotes: 2

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