However, you're assigning it to a float variable. "A narrowing primitive conversion may lose information about the overall magnitude of a numeric value and may also lose precision and range."Įssentially, the conversion is not inferred when it is a narrowing procedure. Using Float.valueOf(): This is a built-in static method of Float class that accepts a given string which is to be converted into float and returns a float value. Java Language Specification – Chapter 5. Conversions and Promotions. When an array of int or String values is passed in, then a. For example, float ('1234.56') evaluates to 1234.56, but float ('giraffe') will return NaN. An int is easily converted to a float, but the contents of a String must resemble a number, or NaN (not a number) will be returned. The Java Language Specification defines this operation as a, "narrowing primitive conversion". Converts an int or String to its floating point representation. This is because the inferred cast, from one value to another, will reduce a plausible accuracy. Main.java:3: error: incompatible types: possible lossy conversion from double to float" The floating point types (float and double) can also be expressed using E or e (for scientific notation), F or f (32-bit float literal) and D or d (64-bit double literal this is the default and by convention is omitted)." It will be whatever the declaring type is-in this case a float. The c variable will not be implicitly converted to a double. Convert both values to float and then compare them (with a margin of error since floats are not precise, Store the value as a string instead of a float., float.
#JAVA STRING TO FLOAT CODE#
in this code 3.1e2 is a double and c should be also a double by default since i read that java will make every float variable a double by default unless you specify the f suffix.
Primitive Data Types (The Java™ Tutorials > Learning the Java Language > Language Basics)Ī floating-point literal is of type float if it ends with the letter F or f otherwise its type is double and it can optionally end with the letter D or d. Here is an except from the Java Tutorial. It treats the 5.6 as a double, not the entire assignment- c is still a float. "I read that java treats float c = 5.6 as a double by default unless you specify the f suffix.
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