ansaurus

Question

Answer 1

+8 A:

long double x; scanf("%Lf", &x);

hrnt 2009-10-07 07:35:29

Answer 2

+2 A:

Either hrnt's answer (scanf("%Lf", &x)) or

long double x;
if(read(fd,&x,sizeof(x))!=sizeof(x)) printf("Oops\n");

the question is very vague.

Michael Krelin - hacker 2009-10-07 07:41:28

If it's C, and not necessarily on Unix, wouldn't fread be better?

Thomas Padron-McCarthy 2009-10-07 07:56:26

I think read() is equally portable. I doubt there's any difference unless you use fscanf on the same file.

Michael Krelin - hacker 2009-10-07 08:04:54

hacker: fread is in the C standard. read is not.

Thomas Padron-McCarthy 2009-10-11 13:45:31

Thomas, I was talking about de facto portability, not standards. For what I can tell by the question, OP doesn't care much about either.

Michael Krelin - hacker 2009-10-11 14:25:10

hacker: Are you saying that read and file descriptors, as shown in your example code above, will work on Windows?

Thomas Padron-McCarthy 2009-10-13 08:43:29

Thomas, last time I checked (over 10 years ago, I'm afraid) it worked on Windows.

Michael Krelin - hacker 2009-10-13 09:48:18

hacker: Ok, in that case I have no complaint. (But hey, it doesn't work on TOPS-20!)

Thomas Padron-McCarthy 2009-10-13 14:53:06

Answer 3

+2 A:

Be aware that "long double" is a synonym for "double" on Visual Studio.

RED SOFT ADAIR 2009-10-07 07:47:57

Answer 4

A:

you can use the format specifier %ld for reading long double variables.

Sachin Chourasiya 2009-10-07 08:25:22

%ld is long decimal, not long double.

Steve Jessop 2009-10-07 15:26:30

Reading in long double in the C programming language.