Thread: Homework due tonight! help please!!

ok, here it is

Code:

#include <string> 
using namespace std; 
#include <fstream> 

#include <iostream.h> 
#include <stdlib.h> 

int main() 
{ 
........ int something; 
........ string infilename, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z; 
........ ifstream fin; 

........ char blah, andy, key[26]; 

........ for (int word = 0;word < 26;word++) { 

............ char key[26] = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'}; 

............ blah == key[word]; 

............ blah = tolower(blah); 

............ cout << "Please enter your replacement for character A: \n"; 
............ cin >> a; 
............ something++; 

............ cout << "Please enter your replacement for character B: \n"; 
............ cin >> b; 
............ something++; 

............ cout << "Please enter your replacement for character C: \n"; 
............ cin >> c; 
............ something++; 

............ cout << "Please enter your replacement for character D: \n"; 
............ cin >> d; 
............ something++; 

............ cout << "Please enter your replacement for character E: \n"; 
............ cin >> e; 
............ something++; 

............ cout << "Please enter your replacement for character F: \n"; 
............ cin >> f; 
............ something++; 

............ cout << "Please enter your replacement for character G: \n"; 
............ cin >> g; 
............ something++; 

............ cout << "Please enter your replacement for character H: \n"; 
............ cin >> h; 
............ something++; 

............ cout << "Please enter your replacement for character I: \n"; 
............ cin >> i; 
............ something++; 

............ cout << "Please enter your replacement for character J: \n"; 
............ cin >> j; 
............ something++; 

............ cout << "Please enter your replacement for character K: \n"; 
............ cin >> k; 
............ something++; 

............ cout << "Please enter your replacement for character L: \n"; 
............ cin >> l; 
............ something++; 

............ cout << "Please enter your replacement for character M: \n"; 
............ cin >> m; 
............ something++; 

............ cout << "Please enter your replacement for character N: \n"; 
............ cin >> n; 
............ something++; 

............ cout << "Please enter your replacement for character O: \n"; 
............ cin >> o; 
............ something++; 

............ cout << "Please enter your replacement for character P: \n"; 
............ cin >> p; 
............ something++; 

............ cout << "Please enter your replacement for character Q: \n"; 
............ cin >> q; 
............ something++; 

............ cout << "Please enter your replacement for character R: \n"; 
............ cin >> r; 
............ something++; 

............ cout << "Please enter your replacement for character S: \n"; 
............ cin >> s; 
............ something++; 

............ cout << "Please enter your replacement for character T: \n"; 
............ cin >> t; 
............ something++; 

............ cout << "Please enter your replacement for character U: \n"; 
............ cin >> u; 
............ something++; 

............ cout << "Please enter your replacement for character V: \n"; 
............ cin >> v; 
............ something++; 

............ cout << "Please enter your replacement for character W: \n"; 
............ cin >> w; 
............ something++; 

............ cout << "Please enter your replacement for character X: \n"; 
............ cin >> x; 
............ something++; 

............ cout << "Please enter your replacement for character Y: \n"; 
............ cin >> y; 
............ something++; 

............ cout << "Please enter your replacement for character Z: \n"; 
............ cin >> z; 
............ something++; 

............ if (something = 26) { 
............ cout << "Please input a file (input)" << endl; 
............ cin >> infilename; 
............ } 
........ } 
........ if (fin.fail()){ 
................ cout << "Error - file opening failed" << endl; 
................ } 
........ while (!fin.eof()) { 
............ if (fin.eof()) 
............ break; 
............ for (int word = 0; word < 26; word++) { 
............ cout << "Your new message is: \n" << key[word] << endl; 
............ } 
........ } 
........ fin.close(); 

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

this was my assignment..

write a program that encodes the text in a data file using a character array named "key" containing 26 characters; this key is read from the keyboard; the first letter contains the character that is to replace the letter "a" in the data file; the second letter contains the letter that is to replace the letter "b" in the data file; and so on; assume that all punctuation is to be replaced by spaces; check to be sure that the key does not map two different characters to the same one during the encoding

and the second part to it is...

write a program which decodes the file that is the output of Problem 27; assume that the same integer key is read from the keyboard by this program and is used in the decoding steps; note that you will not be able to restore the punctuation characters

if (something = 26)

That should be ==
= is the assignment operator
== is boolean equals

Also, you're putting too much into that loop. For instance, the initialization of key should only happen once.

Uh... you don't even try to read it in. Just use

Code:

cin >> key;

.

ok, thanks, im trying that now... and joshdick.. im trying to figure out what you mean by 'the initialization of key should only happen once. '

ugh... it goes down asking for the replacement like it's supposed to and then it asks for the input file and then it asks for the replacement letters again

well, seeing as how i dont know how to do i 26 char string (i haven't been taught) it's kinda hard. i've been trying to do one this whole time, but... im guessing at how to do it.

If I wanted 10 integers from a user, I'd do like so:

Code:

const int MAX = 10;
int a[MAX];

for(int i=0; i < MAX; ++i)
{
   cout << "Enter an integer: ";
   cin >> a[i];
}

Notice how I only need to write the code to input an integer once even though I want to get 10 integers. As a matter of fact, if I wanted 1000 integers, I need only to change MAX to 1000 rather than hard-code 990 more lines of code. Do you see that now?

OOOOHHHHH.... ok, i get it... thank you, see.. that was never explained to me before... lol

Yeah, well, my prof never really explained anything... the only reason i know how to do the file opening is because someone else showed me how to do it...

the only question i have about what the one integer thing is... how do i get the program to ask for the specific replacements of the letters, like "replacement for a: " "replacement for b: ", etc...

hm, the mystring thing is kind of confusing me, i think that's what i need, but i'm not completely sure what the mystring is equal to