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# Data Types

geeta rai
Ranch Hand
Posts: 48
float a = 1; // 1
float b = 1L; // 2
float c = 1F; // 3
float d = 1.0; // 4
Compile time error occurs at 4. Why is //2 valid and //4 is not?

Sagarika nair
Ranch Hand
Posts: 39
Hi Geeta!
float a = 1; // 1
float b = 1L; // 2
float c = 1F; // 3
float d = 1.0; // 4
All floating point values are double by default.So in line 4 ,1.0 is a double and you are assigning it to a float(32 bits) which is a smaller container compared to double(64 bits).So it gives a loss of precision error.It can be compiled by applying a cast as follows:
float d=(float)1.0
or by appending an f to the end of 1.0 i.e float d=1.0f

Cathy Song
Ranch Hand
Posts: 270
Hi Geeta,
Working with money written by Thomas Paul is a good article. This helped me a lot.

geeta rai
Ranch Hand
Posts: 48
Hi Cathy,
I tried to go through the article but it seems a little difficult. Seems i need to study more on data types.
Sagarika, thanks for ur reply but the explaination you gave didn't clear my doubt. If a float is double implicitly and because of loss of precision the compile time error is generated then why is it not the case with Long?