C++ pointer error

Question

When I tried to compile the following C++ program:

//Source: C++ How To Program, Sixth Edition
#include <iostream>
int main()
{
int a;
int *aPtr;
a=7;
aPtr=&a;
std::cout<<"The address of a is: "<<&a<<std::endl;
std::cout<<"The value of aPtr is: "<<aPtr<<std::endl;
std::cout<<"The value of a is: "<<a<<std::endl;
std::cout<<"The value of *aPtr is: "<<*aPtr<<std::endl;
std::cout<<"Showing that * and & are inverses of each"
<<" other"<<std::endl;
std::cout<<"&*aPtr= "<<&*aPtr<<std::endl;
std::cout<<"*&aPtr= "<<*&aPtr<std::endl;
return 0;
}

I got the following error:

enter image description here

Any ideas on that?

Thanks.

I'd suggest you put some more spaces in, e.g. around your operators std::cout << "*&aPtr= " << *&aPtr < std::endl; This would make it all easier to read! — Rup
– Rup, Commented Jan 27, 2011 at 11:04
If you can cut and paste the error as text from the console, that is much easier to read than a picture. — David Rodríguez - dribeas
– David Rodríguez - dribeas, Commented Jan 27, 2011 at 11:15
@David Rodríguez - dribeas. I'm using Cygwin console, and cannot do that. — Simplicity
– Simplicity, Commented Jan 27, 2011 at 11:30

Benoit Thiery · Accepted Answer · 2011-01-27 11:01:50Z

6

Replace

std::cout<<"*&aPtr= "<<*&aPtr<std::endl;

by

std::cout<<"*&aPtr= "<<*&aPtr<<std::endl;

Just a syntax error in your code ( < instead of << ).

answered Jan 27, 2011 at 11:01

Benoit Thiery

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Comments

Jules · Accepted Answer · 2011-01-27 11:02:09Z

3

It looks like a simple typo in line 15. You forgot one "<" between aPTR and the endl-constant ;)

std::cout<<"*&aPtr= "<<*&aPtr<std::endl;

answered Jan 27, 2011 at 11:02

Jules

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Comments

dalle · Accepted Answer · 2011-01-27 11:02:11Z

3

You missed a < on the last line:

//----------------------------v here.
std::cout<<"*&aPtr= "<<*&aPtr<<std::endl;

answered Jan 27, 2011 at 11:02

dalle

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Oliver Charlesworth · Accepted Answer · 2011-01-27 11:02:21Z

3

Yes, the typo on line 15, where you've written < instead of <<. The error message makes that pretty clear!

answered Jan 27, 2011 at 11:02

Oliver Charlesworth

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Comments

Oswald · Accepted Answer · 2011-01-27 11:33:46Z

3

Line 15 says *&aPtr < std::endl. should be << instead of <.

You would spot this kind of error more easily if you put spaces between operators and operants.

edited Jan 27, 2011 at 11:33

answered Jan 27, 2011 at 11:02

Oswald

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Comments

user467871 · Accepted Answer · 2011-01-27 11:02:31Z

2

fix this line (syntax error) (<< instead of <)

std::cout<<"*&aPtr= "<<*&aPtr<std::endl;

answered Jan 27, 2011 at 11:02

user467871

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