Can't be done - there aren't enough bits in a char for a float, a float (usually) takes 32 bits. If your variable is an int you can do it with a cast, but that is extremely discouraged.
Actually, what you mean is not char but char *, address of an asciz string.
What you need to do is use something like sprintf() to make a character string of the value, and then use that.
You can't do a float to a char but you can to a string.
sprintf(buf, "%f", fred);
buf now = "2.345"
use "%x.nf" where x = size and n is no of decimal points for instance
sprintf(buf, "£.2f", fred);
will produce a monitory output.
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