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Floating point values are decimal values with a decimal point (optional) and an optional exponent. A floating-point literal represents a floating-point value. In order to be interpreted as a floating point literal, a numeric value must have either:
A decimal point to indicate it is a floating-point value. for
instance 124.67
A letter E or e (denoting the exponent), for instance 12467e-2
The suffix f or F to indicate that the type of this literal is float.
For instance, 124.67f
The suffix d or D to indicate that the type of this literal is
double. For instance, 124.67d
The floating-point literal can be of two types, float or double. By default, it is of type double. If you want to assign a floating-point literal to a variable of type float, you must attach the suffix F or f to the number.
float f = 12.34; //invalid
float f = 12.34f; //valid
The literal 12.34 is of double type, it cannot be directly assigned to a variable of type float because float (32 bits) is narrower datatype than double (64 bits).
You can redundantly apply the suffix d to the floating-point literals. Following are some valid declarations using floating-point literals.
double d = 12.34; //valid
double d = 12.34D; //valid
double d1 = 1.23E+20; //valid