Help with this C++ Program

Write a program that declares a character array named alphabet and initializes the array to "ABCDEFGHIJKLMNOPQRSTUVWXYZ" In your program, include a FOR LOOP that replaces one character of the array at a time with the lowercase letters a-z. Print the character array to the screen during each iteration of the loop. Hint: Remember that a character array is an array of integer values. Use ASCII values to make the changes.

Okay, I got it to print out everything at once. How would I make it so you press a key, and it does it each time.

Because right now, its showing everything at once.

http://img292.imageshack.us/img292/9...ubitmapyz1.jpg

Code:

#include <iostream.h>
#include <iomanip.h>
#include <string.h>
#include <math.h>
 
int main()
{
char alphabet[27] = {"ABCDEFGHIJKLMNOPQRSTUVWXYZ"};

for (int i=0;i<=25;i++)
{alphabet[i] = alphabet[i] + 32;
	cout << alphabet << "\n";
}
system("pause");
return 0;
}

Any key? If just the enter key, use cin.get().

Not the enter key, something else.. enter key is used to close the program.

There is no standard way to make the code wait for a keypress without the user having to hit the enter key. You could use a function specific to your platform (OS and compiler), like maybe getch(). However, it would probably be better to just use the enter key and keep your code portable.

BTW, <iostream.h> and <iomanip.h> are old and non-standard. They don't work on some modern compilers. You should be using <iostream> and <iomanip> (although you don't need <iomanip> in this program). If your instructor/book/tutorial is teaching you to use these, you should know that they are quite a bit out of date.

Also <cmath> not <math.h>. Plus, why have string.h?

>> Also <cmath> not <math.h>. Plus, why have string.h?
Both <math.h> and <string.h> are standard and will work on modern compilers, although it is of course preferable to use <cmath> and <cstring> if you need them. Of course, in this program, neither of those are necessary either.

Originally Posted by Daved

>> Also <cmath> not <math.h>. Plus, why have string.h?
Both <math.h> and <string.h> are standard and will work on modern compilers, although it is of course preferable to use <cmath> and <cstring> if you need them. Of course, in this program, neither of those are necessary either.

Is there any functional difference between <math.h> and <cmath>, or <string.h> and <string>, in a C++ program? And is there an ongoing trend towards doing away with all of the .h header files in C++, or is it expected that some of them will remain permanently?

<string.h> (properly <cstring>) and <string> are completely different things.

Yes, C++ has done away with the ".h" in all standard libraries. The old C libraries (e.g "math.h") are prefixed "c" -> <cmath>
One difference is that everything is in std:: namespace, helping to avoid naming collisions (which is a good thing).

(Recently I tried to include both <windows.h> and <allegro.h> in a program, but I couldn't do it naively, because of a naming collision: both define a struct BITMAP to begin with.)

I said cmath as a matter of personal preference, to make it clear. Also, the OP should take note that both <math.h>/<cmath> and <string.h>/<cstring>/<string> are not needed in this program.

Originally Posted by anon

<string.h> (properly <cstring>) and <string> are completely different things.

Yes, C++ has done away with the ".h" in all standard libraries. The old C libraries (e.g "math.h") are prefixed "c" -> <cmath>
One difference is that everything is in std:: namespace, helping to avoid naming collisions (which is a good thing).

One program I wrote used the relatively new <inttypes.h> header, which apparently has only a C and not a C++ version yet (<cinttypes> doesn't exist). So far that's the only such case I've seen, though.

That's probably because <inttypes.h> is C99, and not standard in C++.

All C standard library headers that were standard in C when the C++ standard was written are also standard in C++. The C versions with the '.h' are deprecated, and the preferred alternatives for C++ programs are the versions without the '.h' and with the 'c' prefix. You can use either version in a C++ program and it will still compile on a standards-conforming compiler.

Headers added to C99 (after the C++ standard) are not standard in C++, but probably work on some compilers that also support C.

We use microsoft visual C++ 5.0 at school, which I believe is 1998 so thats why you see old headers.

That's too bad. The Express version of the latest Visual C++ is free, and there are other free and modern options available as well. You have to work with what they require, just remember that it is outdated if you continue C++ programming beyond your current school.