Re: [ilug-cal] [OT]Problems with gcc

[Manas Laha]

Sayamindu Dasgupta wrote:
> 
> On Wed, 2003-02-12 at 15:42, Manas Laha wrote:
> > Soumyadip Modak wrote:
> >
> > > #include <stdio.h>
> > >
> > > int main()
> > > {
> > >         float celsius, fahrenht;
> > >
> > >         printf("Enter temp. in Celsius:");
> > >         scanf("%f",celsius);      <--- ERROR here!
> >           scanf( "%f", &celsius );  <--- Should be like this
> > >         fahrenht=(9*celsius/5)+32;
> > >         printf("Fahrenheit temp. is:%.3f",fahrenht);
> > > }
> > >
> >
> > I'm right now not on the machine that has the gcc3.2 compiler, but
> > compiling this program with gcc2.91 shows a syntax error in the line
> > that says "scanf .... ". Obviously, "celsius" should be "&celsius". I
> > wonder why the compiler on your machine didn't signal this error at
> > compile time. Naturally this will cause a "segmentation violation" error
> > at runtime. I must try this out with gcc3.2! This promises to be
> > interesting.
> >
> 
> ..hehe same mistake that I made with my 1st C prog. ;-)
> gcc -Wall solves it
> 
>     [unmadindu@localhost unmadindu]$ gcc -Wall -o ghu test.c
>     test.c: In function `main':
>     test.c:8: warning: format argument is not a pointer (arg 2)
>     test.c:11: warning: control reaches end of non-void function
>     [unmadindu@localhost unmadindu]$
> 
> Also, put a return(0) at the end of the src.
> -sdg-

Quite right! Without the -Wall option to gcc you don't get the warning
about the format arg not being a pointer. Using -Wall always is a good
habit to grow.

- Manas Laha

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