how can I write a code with an input or an output of type double or float??

Hi,

You cannot use float in Verilog, you may define x number of bits for the supported data types. There are 2 data types in Verilog - net and variable data types.

The nets represent the physical connection between structural entities and do not store any value on its own. The variables are used in procedural blocks which can hold value. You may refer to Data Types support list in https://www.intel.com/content/www/us/en/programmable/quartushelp/current/index.htm#hdl/vlog/vlog_list_sys_vlog_d1627e211.htm

Thanks.

Best regards,

KhaiY