out of inner if?

[John Brawley]

Please advise?
I've never fully grasped scope/namespaces, but have been able to work around
earlier problems.
I now have a program flow situation in which I have *no choice* but to do
this this way.
Suppose I have something like;

var1=0.0;

main() {
/*do something sane*/
if (/*condition*/) {
var1=7.65347; //somenumber
}
//use var1's new value
}

How do I get a changed variable back out of an if statement's { } block?
I do math inside the if( ){ now, where before, the math was in the main()
function. I've now no choice: I'm skipping user entry IFF there's a file to
be read, with the same info in it that the user would have entered, so I
have to conditionalize many of the operations that otherwise were in the
main(){. )

I'm missing something simple I'm sure, and I _thought_ if I declared the
variable (initialized or not) outside of the main() function (hence global;
every loop should 'see' it no matter how nested), I could change it and it
would come back out changed, but I've had this same problem several times
now.
The 400+ line program compiles and runs, but my _info_ is gone 'cause it's
being calculated in an if( ){ instead of in the main(){ .

I'm frazzled. Please if there's a short/sweet way to spit the var back out
into the main(), let me know?
Thanks....


--
Peace
JB
jb@tetrahedrave rse.com
Web: http://tetrahedraverse.com

[Ian Collins]

Re: out of inner if?

John Brawley wrote:

Please advise?
I've never fully grasped scope/namespaces, but have been able to work around
earlier problems.
I now have a program flow situation in which I have *no choice* but to do
this this way.
Suppose I have something like;
>
var1=0.0;
>
main() {
/*do something sane*/
if (/*condition*/) {
var1=7.65347; //somenumber
}
//use var1's new value
}
>
How do I get a changed variable back out of an if statement's { } block?

Declare the variable in main, but not in the if scope.

double var1;

if (/*condition*/) {
var1=7.65347; //somenumber
}

--
Ian Collins.

[Pavel]

Re: out of inner if?

John Brawley wrote:

Please advise?
I've never fully grasped scope/namespaces, but have been able to work around
earlier problems.
I now have a program flow situation in which I have *no choice* but to do
this this way.
Suppose I have something like;
>
var1=0.0;
>
main() {
/*do something sane*/
if (/*condition*/) {
var1=7.65347; //somenumber
}
//use var1's new value
}
>
How do I get a changed variable back out of an if statement's { } block?
I do math inside the if( ){ now, where before, the math was in the main()
function. I've now no choice: I'm skipping user entry IFF there's a file to
be read, with the same info in it that the user would have entered, so I
have to conditionalize many of the operations that otherwise were in the
main(){. )
>
I'm missing something simple I'm sure, and I _thought_ if I declared the
variable (initialized or not) outside of the main() function (hence global;
every loop should 'see' it no matter how nested), I could change it and it
would come back out changed, but I've had this same problem several times
now.
The 400+ line program compiles and runs, but my _info_ is gone 'cause it's
being calculated in an if( ){ instead of in the main(){ .
>
I'm frazzled. Please if there's a short/sweet way to spit the var back out
into the main(), let me know?
Thanks....
>
>

It would help if you gave us a little complete example which produces
the output you do not like and tell us what output you expect.
Currently, it is not very clear what the problem is.

-Pavel

[Ian Collins]

Re: out of inner if?

John Brawley wrote:

>>>
>>How do I get a changed variable back out of an if statement's { } block?

>Declare the variable in main, but not in the if scope.
>>
>double var1;
>>
>if (/*condition*/) {
> var1=7.65347; //somenumber
>}

Please learn to trim and quote properly.

Nope; didn't do it....

Then you are doing something silly that you are not telling. Post a
minimal example that compiles and shows your problem.

--
Ian Collins.