problem with nested switches

[MZaza]

Hello,

When I compile it I get an error in line 16, which got case 'c'.

#include <cstdlib>
#include <iostream>
#include <math.h>
using namespace std;

int main()
{
float x, y;
double r;
char o;

cout <<"To use the calculator press C" <<endl <<"To quite press Q"
<<endl;

switch (o);
{
case 'c': cout <<"Enter the mathmatical operation" <<endl;
cin >>x >>o >>y;

switch (o)
{
case '+': r=x+y;
cout <<"The result is: " <<r <<endl;
break;

case '-': r=x-y;
cout <<"The result is: " <<r <<endl;
break;

case '*': r=x*y;
cout <<"The result is: " <<r <<endl;
break;

case '/': r=x/y;
cout <<"The result is: " <<r <<endl;
break;

case '^': r=pow(x, y);
cout <<"The result is: " <<r <<endl;
break;

default: cout <<"Error: wrong input"
<<endl;
}
break;

case 'q': cout <<"cya" <<endl;
break;
}

system("PAUSE") ;
return EXIT_SUCCESS;
}


Guys, I just started programming 2 days ago so take it easy on me :).

--
Mustafa Zaza

[Victor Bazarov]

Re: problem with nested switches

MZaza wrote:

Hello,
>
When I compile it I get an error in line 16, which got case 'c'.
>
#include <cstdlib>
#include <iostream>
#include <math.h>
using namespace std;
>
int main()
{
float x, y;
double r;
char o;
>
cout <<"To use the calculator press C" <<endl <<"To quite press Q"
<<endl;
>
switch (o);

A semicolon? And what is the value of 'o' here?

{
case 'c': cout <<"Enter the mathmatical operation" <<endl;
cin >>x >>o >>y;
>
switch (o)
{
case '+': r=x+y;
cout <<"The result is: " <<r <<endl;
break;
>
case '-': r=x-y;
cout <<"The result is: " <<r <<endl;
break;
>
case '*': r=x*y;
cout <<"The result is: " <<r <<endl;
break;
>
case '/': r=x/y;
cout <<"The result is: " <<r <<endl;
break;
>
case '^': r=pow(x, y);
cout <<"The result is: " <<r <<endl;
break;
>
default: cout <<"Error: wrong input"
<<endl;
}
break;
>
case 'q': cout <<"cya" <<endl;
break;
}
>
system("PAUSE") ;
return EXIT_SUCCESS;
}
>
>
Guys, I just started programming 2 days ago so take it easy on me :).

--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

[Thomas J. Gritzan]

Re: problem with nested switches

MZaza schrieb:

Hello,
>
When I compile it I get an error in line 16, which got case 'c'.

It would help if you provided us the error message you got.

#include <cstdlib>
#include <iostream>
#include <math.h>
using namespace std;
>
int main()
{
float x, y;
double r;
char o;
>
cout <<"To use the calculator press C" <<endl <<"To quite press Q"
<<endl;
>
switch (o);

^
Try to remove the semicolon here.

{
case 'c': cout <<"Enter the mathmatical operation" <<endl;
cin >>x >>o >>y;

[...]

--
Thomas

http://www.netmeister.org/news/learn2quote.html

sigfault

[MZaza]

Re: problem with nested switches

On Mar 5, 9:13 pm, "Victor Bazarov" <v.Abaza...@com Acast.netwrote:

MZaza wrote:

Hello,

>

When I compile it I get an error in line 16, which got case 'c'.

>

#include <cstdlib>
#include <iostream>
#include <math.h>
using namespace std;

>

int main()
{
float x, y;
double r;
char o;

>

cout <<"To use the calculator press C" <<endl <<"To quite press Q"
<<endl;

>

switch (o);

>
A semicolon? And what is the value of 'o' here?
>
>
>

{
case 'c': cout <<"Enter the mathmatical operation" <<endl;
cin >>x >>o >>y;

>

switch (o)
{
case '+': r=x+y;
cout <<"The result is: " <<r <<endl;
break;

>

case '-': r=x-y;
cout <<"The result is: " <<r <<endl;
break;

>

case '*': r=x*y;
cout <<"The result is: " <<r <<endl;
break;

>

case '/': r=x/y;
cout <<"The result is: " <<r <<endl;
break;

>

case '^': r=pow(x, y);
cout <<"The result is: " <<r <<endl;
break;

>

default: cout <<"Error: wrong input"
<<endl;
}
break;

>

case 'q': cout <<"cya" <<endl;
break;
}

>

system("PAUSE") ;
return EXIT_SUCCESS;
}

>

Guys, I just started programming 2 days ago so take it easy on me :).

>
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

I should get the value of the 'o' from the user, just as the x and the
y.
Is that what you mean?

[michael.goossens@gmail.com]

Re: problem with nested switches

o doesnt seem to have a value and the ";" behind "switch(o); " doesn't
seem right.

But tbh switches aren't used that much, but guess you are just
learning :). Keep up the good job.

[MZaza]

Re: problem with nested switches

On Mar 5, 9:24 pm, "michael.gooss. ..@gmail.com"
<michael.gooss. ..@gmail.comwro te:

o doesnt seem to have a value and the ";" behind "switch(o); " doesn't
seem right.
>
But tbh switches aren't used that much, but guess you are just
learning :). Keep up the good job.

Thanks :)
But I got a problem... the program worked faultlessly when I had only
one switch which is the one that got the cases for the mathematical
operations. After I added it in the other switch, which is the one
that got the menu shortcuts it doesn't work probably it just cout this
"To use the calculator press C" <<endl <<"To quite press Q" then it
quits..

Here is a screen shot,

http://img258.imageshack.us/img258/893/98124847qf2.jpg

[michael.goossens@gmail.com]

Re: problem with nested switches

On 5 mrt, 21:32, MZaza <mustafa.z...@g mail.comwrote:

On Mar 5, 9:24 pm, "michael.gooss. ..@gmail.com"
>
<michael.gooss. ..@gmail.comwro te:

o doesnt seem to have a value and the ";" behind "switch(o); " doesn't
seem right.

>

But tbh switches aren't used that much, but guess you are just
learning :). Keep up the good job.

>
Thanks :)
But I got a problem... the program worked faultlessly when I had only
one switch which is the one that got the cases for the mathematical
operations. After I added it in the other switch, which is the one
that got the menu shortcuts it doesn't work probably it just cout this
"To use the calculator press C" <<endl <<"To quite press Q" then it
quits..
>
Here is a screen shot,http://img258.imageshack.us/img258/893/98124847qf2.jpg

do it with if {} else if {} else {} =). Those are nestable 100% and
easier.

[MZaza]

Re: problem with nested switches

On Mar 5, 10:46 pm, "michael.gooss. ..@gmail.com"
<michael.gooss. ..@gmail.comwro te:

On 5 mrt, 21:32, MZaza <mustafa.z...@g mail.comwrote:
>
>
>

On Mar 5, 9:24 pm, "michael.gooss. ..@gmail.com"

>

<michael.gooss. ..@gmail.comwro te:

o doesnt seem to have a value and the ";" behind "switch(o); " doesn't
seem right.

>

But tbh switches aren't used that much, but guess you are just
learning :). Keep up the good job.

>

Thanks :)
But I got a problem... the program worked faultlessly when I had only
one switch which is the one that got the cases for the mathematical
operations. After I added it in the other switch, which is the one
that got the menu shortcuts it doesn't work probably it just cout this
"To use the calculator press C" <<endl <<"To quite press Q" then it
quits..

>

Here is a screen shot,http://img258.imageshack.us/img258/893/98124847qf2.jpg

>
do it with if {} else if {} else {} =). Those are nestable 100% and
easier.

I've tried the if {} else {} and it's not working probably, it does
the if {} even if the condition doesn't match with it and matches with
the else {}.

#include <cstdlib>
#include <iostream>
#include <math.h>
using namespace std;

int main()
{
float x, y;
double r;
char o, c;

cout <<"To use the calculator press C" <<endl <<"To quite press Q"
<<endl;

if (cin >>c)
{
cout <<"Enter the mathmatical operation" <<endl;
cin >>x >>o >>y;

switch (o)
{
case '+': r=x+y;
cout <<"The result is: " <<r <<endl;
break;

case '-': r=x-y;
cout <<"The result is: " <<r <<endl;
break;

case '*': r=x*y;
cout <<"The result is: " <<r <<endl;
break;

case '/': r=x/y;
cout <<"The result is: " <<r <<endl;
break;

case '^': r=pow(x, y);
cout <<"The result is: " <<r <<endl;
break;

default: cout <<"Error: wrong input" <<endl;
}
}

else
{
cout <<"Eorror";
}

system("PAUSE") ;
return EXIT_SUCCESS;
}

[Micah Cowan]

Re: problem with nested switches

"michael.goosse ns@gmail.com" <michael.goosse ns@gmail.comwri tes:

On 5 mrt, 21:32, MZaza <mustafa.z...@g mail.comwrote:

>On Mar 5, 9:24 pm, "michael.gooss. ..@gmail.com"
>>
><michael.gooss ...@gmail.comwr ote:

o doesnt seem to have a value and the ";" behind "switch(o); " doesn't
seem right.

>>

But tbh switches aren't used that much, but guess you are just
learning :). Keep up the good job.

>>
>Thanks :)
>But I got a problem... the program worked faultlessly when I had only
>one switch which is the one that got the cases for the mathematical
>operations. After I added it in the other switch, which is the one
>that got the menu shortcuts it doesn't work probably it just cout this
>"To use the calculator press C" <<endl <<"To quite press Q" then it
>quits..
>>
>Here is a screen shot,http://img258.imageshack.us/img258/893/98124847qf2.jpg

>
do it with if {} else if {} else {} =). Those are nestable 100% and
easier.

switches are also nestable 100%, and I disagree on the "easier".

AFAICT, the reason switch statements are rarer in C++ than in C is
that most in most of the use cases for it in C, polymorphic typing is
the better idiom in C++. However, for cases such as selecting on a
character value read on input (like this one), it seems like the most
straightforward approach, and I at least would find it more readable
than the equivalent in if/else-if.

--
Micah J. Cowan
Programmer, musician, typesetting enthusiast, gamer...

http://micah.cowan.name/

[MZaza]

Re: problem with nested switches

On Mar 6, 12:00 am, MZaza <mustafa.z...@g mail.comwrote:

On Mar 5, 10:46 pm, "michael.gooss. ..@gmail.com"
>
>
>
<michael.gooss. ..@gmail.comwro te:

On 5 mrt, 21:32, MZaza <mustafa.z...@g mail.comwrote:

>

On Mar 5, 9:24 pm, "michael.gooss. ..@gmail.com"

>

<michael.gooss. ..@gmail.comwro te:
o doesnt seem to have a value and the ";" behind "switch(o); " doesn't
seem right.

>

But tbh switches aren't used that much, but guess you are just
learning :). Keep up the good job.

>

Thanks :)
But I got a problem... the program worked faultlessly when I had only
one switch which is the one that got the cases for the mathematical
operations. After I added it in the other switch, which is the one
that got the menu shortcuts it doesn't work probably it just cout this
"To use the calculator press C" <<endl <<"To quite press Q" then it
quits..

>

Here is a screen shot,http://img258.imageshack.us/img258/893/98124847qf2.jpg

>

do it with if {} else if {} else {} =). Those are nestable 100% and
easier.

>
I've tried the if {} else {} and it's not working probably, it does
the if {} even if the condition doesn't match with it and matches with
the else {}.
>
#include <cstdlib>
#include <iostream>
#include <math.h>
using namespace std;
>
int main()
{
float x, y;
double r;
char o, c;
>
cout <<"To use the calculator press C" <<endl <<"To quite press Q"
<<endl;
>
if (cin >>c)
{
cout <<"Enter the mathmatical operation" <<endl;
cin >>x >>o >>y;
>
switch (o)
{
case '+': r=x+y;
cout <<"The result is: " <<r <<endl;
break;
>
case '-': r=x-y;
cout <<"The result is: " <<r <<endl;
break;
>
case '*': r=x*y;
cout <<"The result is: " <<r <<endl;
break;
>
case '/': r=x/y;
cout <<"The result is: " <<r <<endl;
break;
>
case '^': r=pow(x, y);
cout <<"The result is: " <<r <<endl;
break;
>
default: cout <<"Error: wrong input" <<endl;
}
}
>
else
{
cout <<"Eorror";
}
>
system("PAUSE") ;
return EXIT_SUCCESS;
>
}

Any Ideas???

[MZaza]

Re: problem with nested switches

On Mar 6, 12:00 am, MZaza <mustafa.z...@g mail.comwrote:

On Mar 5, 10:46 pm, "michael.gooss. ..@gmail.com"
>
>
>
<michael.gooss. ..@gmail.comwro te:

On 5 mrt, 21:32, MZaza <mustafa.z...@g mail.comwrote:

>

On Mar 5, 9:24 pm, "michael.gooss. ..@gmail.com"

>

<michael.gooss. ..@gmail.comwro te:
o doesnt seem to have a value and the ";" behind "switch(o); " doesn't
seem right.

>

But tbh switches aren't used that much, but guess you are just
learning :). Keep up the good job.

>

Thanks :)
But I got a problem... the program worked faultlessly when I had only
one switch which is the one that got the cases for the mathematical
operations. After I added it in the other switch, which is the one
that got the menu shortcuts it doesn't work probably it just cout this
"To use the calculator press C" <<endl <<"To quite press Q" then it
quits..

>

Here is a screen shot,http://img258.imageshack.us/img258/893/98124847qf2.jpg

>

do it with if {} else if {} else {} =). Those are nestable 100% and
easier.

>
I've tried the if {} else {} and it's not working probably, it does
the if {} even if the condition doesn't match with it and matches with
the else {}.
>
#include <cstdlib>
#include <iostream>
#include <math.h>
using namespace std;
>
int main()
{
float x, y;
double r;
char o, c;
>
cout <<"To use the calculator press C" <<endl <<"To quite press Q"
<<endl;
>
if (cin >>c)
{
cout <<"Enter the mathmatical operation" <<endl;
cin >>x >>o >>y;
>
switch (o)
{
case '+': r=x+y;
cout <<"The result is: " <<r <<endl;
break;
>
case '-': r=x-y;
cout <<"The result is: " <<r <<endl;
break;
>
case '*': r=x*y;
cout <<"The result is: " <<r <<endl;
break;
>
case '/': r=x/y;
cout <<"The result is: " <<r <<endl;
break;
>
case '^': r=pow(x, y);
cout <<"The result is: " <<r <<endl;
break;
>
default: cout <<"Error: wrong input" <<endl;
}
}
>
else
{
cout <<"Eorror";
}
>
system("PAUSE") ;
return EXIT_SUCCESS;
>
}

Any Ideas???

[MZaza]

Re: problem with nested switches

On Mar 6, 12:00 am, MZaza <mustafa.z...@g mail.comwrote:

On Mar 5, 10:46 pm, "michael.gooss. ..@gmail.com"
>
>
>
<michael.gooss. ..@gmail.comwro te:

On 5 mrt, 21:32, MZaza <mustafa.z...@g mail.comwrote:

>

On Mar 5, 9:24 pm, "michael.gooss. ..@gmail.com"

>

<michael.gooss. ..@gmail.comwro te:
o doesnt seem to have a value and the ";" behind "switch(o); " doesn't
seem right.

>

But tbh switches aren't used that much, but guess you are just
learning :). Keep up the good job.

>

Thanks :)
But I got a problem... the program worked faultlessly when I had only
one switch which is the one that got the cases for the mathematical
operations. After I added it in the other switch, which is the one
that got the menu shortcuts it doesn't work probably it just cout this
"To use the calculator press C" <<endl <<"To quite press Q" then it
quits..

>

Here is a screen shot,http://img258.imageshack.us/img258/893/98124847qf2.jpg

>

do it with if {} else if {} else {} =). Those are nestable 100% and
easier.

>
I've tried the if {} else {} and it's not working probably, it does
the if {} even if the condition doesn't match with it and matches with
the else {}.
>
#include <cstdlib>
#include <iostream>
#include <math.h>
using namespace std;
>
int main()
{
float x, y;
double r;
char o, c;
>
cout <<"To use the calculator press C" <<endl <<"To quite press Q"
<<endl;
>
if (cin >>c)
{
cout <<"Enter the mathmatical operation" <<endl;
cin >>x >>o >>y;
>
switch (o)
{
case '+': r=x+y;
cout <<"The result is: " <<r <<endl;
break;
>
case '-': r=x-y;
cout <<"The result is: " <<r <<endl;
break;
>
case '*': r=x*y;
cout <<"The result is: " <<r <<endl;
break;
>
case '/': r=x/y;
cout <<"The result is: " <<r <<endl;
break;
>
case '^': r=pow(x, y);
cout <<"The result is: " <<r <<endl;
break;
>
default: cout <<"Error: wrong input" <<endl;
}
}
>
else
{
cout <<"Eorror";
}
>
system("PAUSE") ;
return EXIT_SUCCESS;
>
}

Any Ideas???

[lollinus@gmail.com]

Re: problem with nested switches

On 5 Mar, 20:12, MZaza <mustafa.z...@g mail.comwrote:

Hello,
>
When I compile it I get an error in line 16, which got case 'c'.
>
#include <cstdlib>
#include <iostream>
#include <math.h>
using namespace std;
>
int main()
{
float x, y;
double r;
char o;
>
cout <<"To use the calculator press C" <<endl <<"To quite press Q"
<<endl;

cin >o;

You need to acquire first o;

>
switch (o);

^
There you go. Remove this semicolon and it should work fine.

{
case 'c': cout <<"Enter the mathmatical operation" <<endl;
cin >>x >>o >>y;
>
switch (o)
{
case '+': r=x+y;
cout <<"The result is: " <<r <<endl;
break;
>
case '-': r=x-y;
cout <<"The result is: " <<r <<endl;
break;
>
case '*': r=x*y;
cout <<"The result is: " <<r <<endl;
break;
>
case '/': r=x/y;
cout <<"The result is: " <<r <<endl;
break;
>
case '^': r=pow(x, y);
cout <<"The result is: " <<r <<endl;
break;
>
default: cout <<"Error: wrong input"
<<endl;
}
break;
>
case 'q': cout <<"cya" <<endl;
break;
}
>
system("PAUSE") ;
return EXIT_SUCCESS;
>
}
>
Guys, I just started programming 2 days ago so take it easy on me :).
>
--
Mustafa Zaza

[Victor Bazarov]

Re: problem with nested switches

MZaza wrote:

[..]
>
Any Ideas???

Posted the same message three times within 5 minutes. It seem
you're desperate. But even if it's so there is no need to pollute
Usenet. Patience is a virtue. Newsgroups are not chat rooms.

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

[MZaza]

Re: problem with nested switches

On Mar 6, 12:22 am, "Victor Bazarov" <v.Abaza...@com Acast.netwrote:

MZaza wrote:

[..]

>

Any Ideas???

>
Posted the same message three times within 5 minutes. It seem
you're desperate. But even if it's so there is no need to pollute
Usenet. Patience is a virtue. Newsgroups are not chat rooms.
>
V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

@victor
There was a problem with my browser, when I refreshed to check if
there are new answers it reposted the message again.