Cant understand this one

[Rich]

Hi all

I am using DEVCPP 4.9.8.1 which uses MingW32 GCC 3.2 compiler

I am trying to compile this program, but without success, I am sure the
compiler is set up ok, as I can compile and run hello.cpp fine

here is the listing please can someone tell what I am doing wrong please

#include <iostream>
#include <cstdlib>

using namespace std;

int integerPower ( int, int ) ;

int main( void )
{
int x, y ;

cout << "First enter the base number, folowed by the component: " << endl
;
cin >> x, y ;

cout << integerPower ( x, y ) << endl ;

int integerPower ( int base, int component )
{
int ans = base ;
for ( i = component; i >=1; --i )
{
ans *= base ;
}

return ans;
}
system("PAUSE") ;
return 0;
}

and here is the compile log

Compiler: Default compiler
Building Makefile: "M:\C++\How To Program\CH03\Ex 3_18\Makefile.w in"
Executing make...
make.exe -f "M:\C++\How To Program\CH03\Ex 3_18\Makefile.w in" all
g++.exe -c ex3_18.cpp -o
x3_18.o -I"K:/Eric/Dev-Cpp/include/c++" -I"K:/Eric/Dev-Cpp/include/c++/ming
w32" -I"K:/Eric/Dev-Cpp/include/c++/backward" -I"K:/Eric/Dev-Cpp/include"

ex3_18.cpp: In function `int main()':
ex3_18.cpp:18: parse error before `{' token

ex3_18.cpp:20: `component' undeclared (first use this function)
ex3_18.cpp:20: (Each undeclared identifier is reported only once for each
function it appears in.)
ex3_18.cpp:22: `ans' undeclared (first use this function)
ex3_18.cpp:22: `base' undeclared (first use this function)

ex3_18.cpp: At global scope:
ex3_18.cpp:27: ISO C++ forbids declaration of `system' with no type

ex3_18.cpp:27: `int system' redeclared as different kind of symbol
K:/Eric/Dev-Cpp/include/stdlib.h:373: previous declaration of `int
system(const
char*)'
ex3_18.cpp:27: invalid conversion from `const char*' to `int'
ex3_18.cpp:28: parse error before `return'

make.exe: *** [ex3_18.o] Error 1

Execution terminated

I notice that it is moaning about component, which is being passed in to the
function as an argument, I didnt think I needed to declare component first,
as I have already done so in the function prototype, like I say this one has
confused me
TIA

[Allan Bruce]

Re: Cant understand this one


"Rich" <REMOVEAmigaBlo ke@yahoo.co.uk> wrote in message
news:bfbt4d$jtc $1@pheidippides .axion.bt.co.uk ...[color=blue]
> Hi all
>
> I am using DEVCPP 4.9.8.1 which uses MingW32 GCC 3.2 compiler
>
> I am trying to compile this program, but without success, I am sure the
> compiler is set up ok, as I can compile and run hello.cpp fine
>
> here is the listing please can someone tell what I am doing wrong please
>
> #include <iostream>
> #include <cstdlib>
>
> using namespace std;
>
> int integerPower ( int, int ) ;
>
> int main( void )
> {
> int x, y ;
>
> cout << "First enter the base number, folowed by the component: " <<[/color]
endl[color=blue]
> ;
> cin >> x, y ;
>
> cout << integerPower ( x, y ) << endl ;
>[/color]

You can define a function within a function or indeed main(), so remove from
here
[color=blue]
> int integerPower ( int base, int component )
> {
> int ans = base ;
> for ( i = component; i >=1; --i )
> {
> ans *= base ;
> }
>
> return ans;
> }[/color]

to here, and then place it at the end of the file
Allan

[color=blue]
> system("PAUSE") ;
> return 0;
> }
>
> and here is the compile log
>
> Compiler: Default compiler
> Building Makefile: "M:\C++\How To Program\CH03\Ex 3_18\Makefile.w in"
> Executing make...
> make.exe -f "M:\C++\How To Program\CH03\Ex 3_18\Makefile.w in" all
> g++.exe -c ex3_18.cpp -o
>[/color]
3_18.o -I"K:/Eric/Dev-Cpp/include/c++" -I"K:/Eric/Dev-Cpp/include/c++/ming[color=blue]
>[/color]
32" -I"K:/Eric/Dev-Cpp/include/c++/backward" -I"K:/Eric/Dev-Cpp/include"[color=blue]
>
> ex3_18.cpp: In function `int main()':
> ex3_18.cpp:18: parse error before `{' token
>
> ex3_18.cpp:20: `component' undeclared (first use this function)
> ex3_18.cpp:20: (Each undeclared identifier is reported only once for each
> function it appears in.)
> ex3_18.cpp:22: `ans' undeclared (first use this function)
> ex3_18.cpp:22: `base' undeclared (first use this function)
>
> ex3_18.cpp: At global scope:
> ex3_18.cpp:27: ISO C++ forbids declaration of `system' with no type
>
> ex3_18.cpp:27: `int system' redeclared as different kind of symbol
> K:/Eric/Dev-Cpp/include/stdlib.h:373: previous declaration of `int
> system(const
> char*)'
> ex3_18.cpp:27: invalid conversion from `const char*' to `int'
> ex3_18.cpp:28: parse error before `return'
>
> make.exe: *** [ex3_18.o] Error 1
>
> Execution terminated
>
> I notice that it is moaning about component, which is being passed in to[/color]
the[color=blue]
> function as an argument, I didnt think I needed to declare component[/color]
first,[color=blue]
> as I have already done so in the function prototype, like I say this one[/color]
has[color=blue]
> confused me
> TIA
>
>[/color]

[Artie Gold]

Re: Cant understand this one

Allan Bruce wrote:[color=blue]
> "Rich" <REMOVEAmigaBlo ke@yahoo.co.uk> wrote in message
> news:bfbt4d$jtc $1@pheidippides .axion.bt.co.uk ...
>[color=green]
>>Hi all
>>
>>I am using DEVCPP 4.9.8.1 which uses MingW32 GCC 3.2 compiler
>>
>>I am trying to compile this program, but without success, I am sure the
>>compiler is set up ok, as I can compile and run hello.cpp fine
>>
>>here is the listing please can someone tell what I am doing wrong please
>>
>>#include <iostream>
>>#include <cstdlib>
>>
>>using namespace std;
>>
>>int integerPower ( int, int ) ;
>>
>>int main( void )
>>{
>> int x, y ;
>>
>> cout << "First enter the base number, folowed by the component: " <<[/color]
>
> endl
>[color=green]
>>;
>> cin >> x, y ;[/color][/color]
cin >> x >> y;
[color=blue][color=green]
>>
>> cout << integerPower ( x, y ) << endl ;
>>[/color]
>
>
> You can define a function within a function or indeed main(), so remove from[/color]
^^^^^
can't
[color=blue]
> here
>
>[color=green]
>> int integerPower ( int base, int component )
>> {
>> int ans = base ;
>> for ( i = component; i >=1; --i )
>> {
>> ans *= base ;
>> }
>>
>> return ans;
>> }[/color]
>
>
> to here, and then place it at the end of the file
> Allan
>
>
>[color=green]
>> system("PAUSE") ;
>> return 0;
>>}
>>
>>and here is the compile log
>>
>>Compiler: Default compiler
>>Building Makefile: "M:\C++\How To Program\CH03\Ex 3_18\Makefile.w in"
>>Executing make...
>>make.exe -f "M:\C++\How To Program\CH03\Ex 3_18\Makefile.w in" all
>>g++.exe -c ex3_18.cpp -o
>>[/color]
>
> 3_18.o -I"K:/Eric/Dev-Cpp/include/c++" -I"K:/Eric/Dev-Cpp/include/c++/ming
>
> 32" -I"K:/Eric/Dev-Cpp/include/c++/backward" -I"K:/Eric/Dev-Cpp/include"
>[color=green]
>>ex3_18.cpp: In function `int main()':
>>ex3_18.cpp:18 : parse error before `{' token
>>
>>ex3_18.cpp:20 : `component' undeclared (first use this function)
>>ex3_18.cpp:20 : (Each undeclared identifier is reported only once for each
>> function it appears in.)
>>ex3_18.cpp:22 : `ans' undeclared (first use this function)
>>ex3_18.cpp:22 : `base' undeclared (first use this function)
>>
>>ex3_18.cpp: At global scope:
>>ex3_18.cpp:27 : ISO C++ forbids declaration of `system' with no type
>>
>>ex3_18.cpp:27 : `int system' redeclared as different kind of symbol
>>K:/Eric/Dev-Cpp/include/stdlib.h:373: previous declaration of `int
>>system(cons t
>> char*)'
>>ex3_18.cpp:27 : invalid conversion from `const char*' to `int'
>>ex3_18.cpp:28 : parse error before `return'
>>
>>make.exe: *** [ex3_18.o] Error 1
>>
>>Execution terminated
>>
>>I notice that it is moaning about component, which is being passed in to[/color]
>
> the
>[color=green]
>>function as an argument, I didnt think I needed to declare component[/color]
>
> first,
>[color=green]
>>as I have already done so in the function prototype, like I say this one[/color]
>
> has
>[color=green]
>>confused me[/color][/color]


See above.
HTH,
--ag


--
Artie Gold -- Austin, Texas

[Rich]

Re: Cant understand this one

cin >> x >> y;

Thanks :)
[color=blue][color=green]
> > You can define a function within a function or indeed main(), so remove[/color][/color]
from[color=blue]
> ^^^^^
> can't
>[/color]

Ahhh I did wonder if Allan might have meant can't, as it was already
defined in main

I forgot that it is not allowed to define a function within a function, and
that main is itself a function

cheers guys

Rich[color=blue]
> See above.
> HTH,
> --ag
>
>
> --
> Artie Gold -- Austin, Texas
>[/color]

[Allan Bruce]

Re: Cant understand this one


"Artie Gold" <artiegold@aust in.rr.com> wrote in message
news:3F197998.5 000908@austin.r r.com...[color=blue]
> Allan Bruce wrote:[color=green]
> > "Rich" <REMOVEAmigaBlo ke@yahoo.co.uk> wrote in message
> > news:bfbt4d$jtc $1@pheidippides .axion.bt.co.uk ...
> >[color=darkred]
> >>Hi all
> >>
> >>I am using DEVCPP 4.9.8.1 which uses MingW32 GCC 3.2 compiler
> >>
> >>I am trying to compile this program, but without success, I am sure the
> >>compiler is set up ok, as I can compile and run hello.cpp fine
> >>
> >>here is the listing please can someone tell what I am doing wrong please
> >>
> >>#include <iostream>
> >>#include <cstdlib>
> >>
> >>using namespace std;
> >>
> >>int integerPower ( int, int ) ;
> >>
> >>int main( void )
> >>{
> >> int x, y ;
> >>
> >> cout << "First enter the base number, folowed by the component: " <<[/color]
> >
> > endl
> >[color=darkred]
> >>;
> >> cin >> x, y ;[/color][/color]
> cin >> x >> y;
>[color=green][color=darkred]
> >>
> >> cout << integerPower ( x, y ) << endl ;
> >>[/color]
> >
> >
> > You can define a function within a function or indeed main(), so remove[/color][/color]
from[color=blue]
> ^^^^^
> can't
>[color=green]
> > here
> >
> >[color=darkred]
> >> int integerPower ( int base, int component )
> >> {
> >> int ans = base ;
> >> for ( i = component; i >=1; --i )
> >> {
> >> ans *= base ;
> >> }
> >>
> >> return ans;
> >> }[/color]
> >
> >
> > to here, and then place it at the end of the file
> > Allan
> >
> >
> >[color=darkred]
> >> system("PAUSE") ;
> >> return 0;
> >>}
> >>
> >>and here is the compile log
> >>
> >>Compiler: Default compiler
> >>Building Makefile: "M:\C++\How To Program\CH03\Ex 3_18\Makefile.w in"
> >>Executing make...
> >>make.exe -f "M:\C++\How To Program\CH03\Ex 3_18\Makefile.w in" all
> >>g++.exe -c ex3_18.cpp -o
> >>[/color]
> >
> >[/color][/color]
_18.o -I"K:/Eric/Dev-Cpp/include/c++" -I"K:/Eric/Dev-Cpp/include/c++/ming[color=blue][color=green]
> >
> >[/color][/color]
2" -I"K:/Eric/Dev-Cpp/include/c++/backward" -I"K:/Eric/Dev-Cpp/include"[color=blue][color=green]
> >[color=darkred]
> >>ex3_18.cpp: In function `int main()':
> >>ex3_18.cpp:18 : parse error before `{' token
> >>
> >>ex3_18.cpp:20 : `component' undeclared (first use this function)
> >>ex3_18.cpp:20 : (Each undeclared identifier is reported only once for[/color][/color][/color]
each[color=blue][color=green][color=darkred]
> >> function it appears in.)
> >>ex3_18.cpp:22 : `ans' undeclared (first use this function)
> >>ex3_18.cpp:22 : `base' undeclared (first use this function)
> >>
> >>ex3_18.cpp: At global scope:
> >>ex3_18.cpp:27 : ISO C++ forbids declaration of `system' with no type
> >>
> >>ex3_18.cpp:27 : `int system' redeclared as different kind of symbol
> >>K:/Eric/Dev-Cpp/include/stdlib.h:373: previous declaration of `int
> >>system(cons t
> >> char*)'
> >>ex3_18.cpp:27 : invalid conversion from `const char*' to `int'
> >>ex3_18.cpp:28 : parse error before `return'
> >>
> >>make.exe: *** [ex3_18.o] Error 1
> >>
> >>Execution terminated
> >>
> >>I notice that it is moaning about component, which is being passed in to[/color]
> >
> > the
> >[color=darkred]
> >>function as an argument, I didnt think I needed to declare component[/color]
> >
> > first,
> >[color=darkred]
> >>as I have already done so in the function prototype, like I say this one[/color]
> >
> > has
> >[color=darkred]
> >>confused me[/color][/color]
>
>
> See above.
> HTH,
> --ag
>
>
> --
> Artie Gold -- Austin, Texas
>[/color]

Er, yup thats what I meant ;-)
Allan