Keil4 cannot define floating-point numbers.

What you want to ask is that keil4 can't define floating-point numbers? Keil4 has no floating-point number that cannot be defined. Floating-point numbers in keil4 language are required to be aligned with the eight segments of the stack, so floating-point numbers can be defined. If the system default stack is not eight-segment alignment, there will be abnormal floating-point number support problems.