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Floating Point Literals

In order to write a floating point number in a program, you use a "floating-point literal."

1.5

Any number written with a decimal point is a floating point literal.

double pi = 3.14;

This includes numbers where a decimal point is written, but there is no fractional part to the number.

5.0

You cannot directly give a value to an integer variable using a floating point literal, even if there is no fractional part to the number.

// this will not work
int x = 5.0;

The reverse is possible though. You can give a value to a variable that stores a floating point number using an integer literal.

double x = 5;