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Reg STORAGE CLASSES
Joined: 25 Jul 2003
Posts: 4
Reg STORAGE CLASSES
HI,
Can anyone help me in (brief) understanding the below code
int i=0; main( ) { auto int i=1; printf("%d
",i); i=1 { int i=2; printf("%d
",i); i=2 { i+=1; printf("%d
",i); i=3 }
printf("%d
",i); i=3 } printf("%d
",i); i=1
}
i want 2 know what`s happening in the outer block i.e 5th printf statement
main() { auto float f1=20.4; { f1=10.8; { f1=5.3; printf("%f",f1); f1=5.3 } printf("%f",f1); f1=5.3
} printf( "%f",f1); f1=5.3 }
similarly here in the 3rd printf statement !
with Regards,
ashwini
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Joined: 19 Jul 2003
Posts: 29
Reg STORAGE CLASSES
Please see my embedded comments in the code
--- suganthi rams <ashvinistar@...> wrote:
> HI,
>
> Can anyone help me in (brief) understanding the
> below code
>
> int i=0;
> main( )
> {
> // defines i
> auto int i=1;
> printf("%d
",i); i=1
> {
> // defines new i, known in this block only
> int i=2;
> printf("%d
",i); i=2
> {
> // outer block`s i(=2) used here
> i+=1;
> printf("%d
",i); i=3
> }
> // still i(=2) used here
> printf("%d
",i); i=3
>
> }
> // block ends, so new def not applicable
> // i(=1) is used here
> printf("%d
",i); i=1
> }
> i want 2 know what`s happening in the outer block
> i.e 5th printf statement
>
> main()
> {
> // definition of f1
> auto float f1=20.4;
> {
> // no new definition, old var used
> f1=10.8;
> {
> // still no new definition
> f1=5.3;
> printf("%f",f1); f1=5.3
> }
> printf("%f",f1); f1=5.3
>
> }
> printf( "%f",f1); f1=5.3
> }
>
> similarly here in the 3rd printf statement !
Well everything`s in order, isn`t it?
Regards,
Shantanu
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Joined: 27 Aug 2003
Posts: 1
Reg STORAGE CLASSES
Hi..
When ever u declare a variable inside braces(`{`), the scope of the variable expires when u come out of the brace(`}`). In your example, inside each brace, you are declaring `i`. That `i` expires when you come out of the brace.
You are giving auto int i = 1 and after that you are opening and closing 2 braces. After coming out of all these, u are still inside the main brace. There i is 1. Thats why you got the result 1.
In the second case, you are declaring only once. Thats outside all the braces. Its scope exists until the end of main. Inside the braces, you are just assigning the values.. Thats why you got 5.3 at the last also.
Hope you are clear with the answer. If not, pls feel free to ask.
Regards,
K.Raj
suganthi rams <ashvinistar@...>
26/08/2003 09:09 PM
Please respond to Programmers-Town
To: C-Guru@yahoogroups.com, Programmers-Town@yahoogroups.com
cc:
Subject: *(&Programmers-Town&)* Reg STORAGE CLASSES
HI,
Can anyone help me in (brief) understanding the below code
int i=0;
main( )
{
auto int i=1;
printf("%d
",i); i=1
{
int i=2;
printf("%d
",i); i=2
{
i+=1;
printf("%d
",i); i=3
}
printf("%d
",i); i=3
}
printf("%d
",i); i=1
}
i want 2 know what`s happening in the outer block i.e 5th printf statement
main()
{
auto float f1=20.4;
{
f1=10.8;
{
f1=5.3;
printf("%f",f1); f1=5.3
}
printf("%f",f1); f1=5.3
}
printf( "%f",f1); f1=5.3
}
similarly here in the 3rd printf statement !
with Regards,
ashwini
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