Re: [Dev-C++] double and float ??

No, you can't use an old c++ manual (or actually C manual).
It must be a broken manual.

The runtime library must know the physical size of the variable to be able
to initialize it.

For printf() you send a value. The standard says that functions without a
prototype - or variadric functions - should have the variables upgraded
from float to double on call. This makes printf() support float and
double.

However, scanf() doesn't take a float our double. It takes a pointer to a
float or double. To perform the assign - it has to look at the
"formatting" parameter to decide what it should assign to.

%f specifies float
%lf specifies double
%Lf specifies long double (when supported)

/Per W

On Thu, 23 Feb 2006, Titi Anggono wrote:

> Hi all,
>
> I tried the following code
> ============================
> #include <stdio.h>
> #include <stdlib.h>
> #include <conio.h>
>
> main(){
>     double a,b;
>     scanf("%f",&a);
>     printf("\n");
>     scanf("%f",&b);
>     printf("\n\n%f   %f",a,b);
>     getch();
>     exit(EXIT_SUCCESS);
> }
> ==============================
> I enter any numbers and the output is
> 0.0000   0.00000
> but, when I change the "double" with "float", the code
> gives me the right answer.
>
> Is there any explanation why I can't use "double" with
> "%f" in dev-cpp ? Maybe I use old c++ manual lol. How
> can I print the "double" number ?
>
> Titi
>
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