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Sep 20th, 2009

Question about extra whitespace

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I was given some code by my Professor and I had to debug it. I finally found the problem, but I have no idea why it is a problem. Could someone please enlighten me.

Here is the piece of the code that has been corrected:

C++ Syntax (Toggle Plain Text)
.
.
.
//Using negative subscripts
	cout<<"\nUsing negative subscripts"<<endl;
	p = a + n-1;
	for (size_t i =0; i < n ; ++i)
		cout << p[-i] << ' ';
		cout<< endl;
.
.
.
//Using negative subscripts
	cout<<"\nUsing negative subscripts"<<endl;
	p = a + n-1;
	for (size_t i =0; i < n ; ++i)
		cout << p[-i] << ' ';
		cout<< endl;

Here is the original code piece with the error:

C++ Syntax (Toggle Plain Text)
.
.
.
//Using negative subscripts
	cout<<"\nUsing negative subscripts"<<endl;
	p = a + n-1;
	for (size_t i =0; i < n ; ++i)
		cout << p[-i] << '  ';     //   <------ There is an extra space.
		cout<< endl;
.
.
.
//Using negative subscripts
	cout<<"\nUsing negative subscripts"<<endl;
	p = a + n-1;
	for (size_t i =0; i < n ; ++i)
		cout << p[-i] << '  ';     //   <------ There is an extra space.
		cout<< endl;

Why does it display what it does, instead of just add two spaces between each number?

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Wolf CCMLG

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Sep 20th, 2009

Re: Question about extra whitespace

..aren't single inverted commas just for char variables? Maybe that would cause a problem because the compiler would be expecting one character and receives two. Just a guess

KonkaNok

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Sep 20th, 2009

Re: Question about extra whitespace

that is the problem

c++ Syntax (Toggle Plain Text)
cout << 'a';  //  good
cout << ' ';  //  good
cout << 'ab';  //  bad
cout << '  ';  // bad
cout << 'a';  //  good
cout << ' ';  //  good
cout << 'ab';  //  bad
cout << '  ';  // bad

Last edited by NathanOliver; Sep 20th, 2009 at 9:56 pm.

NathanOliver

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Sep 20th, 2009

Re: Question about extra whitespace

OK, you found the compile time error.

Now, there's still a potentially fatal logical error to be corrected.

vmanes

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Posting Virtuoso

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