🚀 go-pugleaf

Is there a way to allow a null input for scanf?
I need to be able to just press [enter]  to return 0, when prompting for
a 
user input.  Basic's "input x" works this way and is very useful when
prompting 
with default values. Maybe there is another command more like basic's
"input". 

scanf("%f",&x);  seems to require an entry prier to pushing [enter].
If you only press [enter] scanf still waits for input. 

test.c does not work the same as test.bas.. test.c requires you type [0]
then [enter].
In test.bas you just press [enter] to return 0.

/** test.c **/
amount= 5.3
printf("Enter a value <%d> ",amount);
scanf("%d",&f);
    if (x1 != 0) amount=x1;


REM ** test.bas **
amout= 5.3
PRINT "Enter a value. <"; amount; "> ";
INPUT x
IF x <> 0 THEN amount = x


Maybe I need to pre-stuff the input buffer with a leading zero? If this
is what is needed,
how would it be done. 


Thanks