Letters to Numbers

[xHyperionx]

Okay, so I have a science fair project and I decided on doing a series of programs that show the simpleness behind hacking a password. Each program increases in complexity starting with a four digit password, and ending with a 10 digit letter and number combo that is case sensitive. Right now I need to figure out a way to have my program be able to convert chars into ints, so that I can do a counter and then I also need to be able to convert the ints, back into chars. Thank you! Love to get an answer back ASAP and...MERRY CHRISTMAS!

[MiiNiPaa]

convert chars into ints

int i = static_cast<int>(c);

ints, back into chars

char c = static_cast<char>(i);

ending with a 10 digit letter and number combo that is case sensitive

So my lO)bnS/h`Cr0d{U(;aKQqT<r is safe, then?

[xHyperionx]

Well I haven't reached the 10 digit combo program yet, I'm working on the second program in the series which would allow the user to enter a five digit letter only password that is uppercase only, and I need to convert each of those letters that they input, into a number. From there I would just set a counter and a bunch of either switch of if-else statements to check where the number should go. But. How do I get The inputted letters to change to a number????? Aslo, what headers would I use?

[MiiNiPaa]

xHyperionx wrote:

How do I get The inputted letters to change to a number

MiiNiPaa wrote:

int i = static_cast<int>(c);

Inside computer there are no characters. There are numbers. Computer uses something called character table to know that, say , character number 97 sould be drawn as 'a'
A digit '0' in fact is a character number 48 in ASCII

[lordseanington]

Actually there are no numbers, its binary.

What is your question, MiiNiPaa gave you one of the best ways to do it.

[MiiNiPaa]

> Binary.
Especially in ternary computers.

And also it is binary numbers. Almost all assembly commands (aside fro those which threats register content as address) works as arithmetic operations.

[xHyperionx]

I'm still confused, so what is the code in order to get it to change into a number for me to be able to put a counter? and what are the headers necessary?

[MiiNiPaa]

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#include <iostream> int main() { //Hope nobody will use upper ASCII plane //Otherwise you should handle signed/unsigned chars yourself int frequency_table[128] = { 0 }; char c = '\0'; //Or int. It works either way while((c = std::cin.get()) != '\n') ++frequency_table[c]; for(int i = 0; i < 128; ++i) if (frequency_table[i] != 0) std::cout << (c = i) << ": " << frequency_table[i] << '\n'; // std::cout << static_cast<char>(i) << ": " << frequency_table[i] << '\n'; }

Hello H: 1 e: 1 l: 2 o: 1

[xHyperionx]

ok but can you please explain to me what all of this does, because I cannot just copy your work and pass it off as my own?

[MiiNiPaa]

Line 6: create a table all possible (and some impossible) base ASCII characters can be indices of. Base ASCII characters have codes 0-127.

Line 8: read character from standard input and save it to c, until we hit newline
Line 9: increment corresponding element of table. Uses char as int. (no actual conversion as char is already an integer)

Line 10 - 11: loop over the table and print all characters encountered at least once. Uses trick to convert integer to char. Commented out line uses explicit cast instead.

[xHyperionx]

hmmm ok so if i wanted it to go from "A" to "Z" I would input it something like with the frequency table: int frequency_table[90] = {65}; is that right?

[MiiNiPaa]

No. Except for situation where all your letters count should start from 65.
Code will be the same. Just output only values of 'A'-'Z':

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for(int i = 'A'; i < 'Z' + 1; ++i) if (frequency_table[i] != 0) std::cout << (c = i) << ": " << frequency_table[i] << '\n';

HeLLO! H: 1 L: 2 O: 1

[xHyperionx]

wait but I DO want it to start from 65 and only go to 90, because this is a prgram which only does uppercase alphabet

[MiiNiPaa]

I DO want it to start from 65

Ok, so output you want is:

HeLLO!
H: 66
L: 67
O: 66

right?

[xHyperionx]

no ur not understanding my program lol, her lemme try to explain better: My program should do output something like:

Please enter your maximum five digit uppercase alphabetical only password: PGGS
AAAAAAABAAACAAADAAAEAAAFAAAGAAAHAAAIAAAJAAAKAAALAAAMAAANAAAOAAAPAAAQAAARAAAS

AABSAACSAADSAAESAAFSAAGS

ABGSACGSADGSAEGSAFGSAGGS

BGGSCGGSDGGSDGGSEGGSFGGSGGGSHGGSIGGSJGGSKGGSLGGSMGGSNGGSOGGSPGGS

Your password is: PGGS



It can be formatted differently of course and the format shouldnt be too hard to do but i need it to like loop around if i could i would show u a file of what i have done for my first program.

[xHyperionx]

I'm just not sure how to attach a file here lol

[MiiNiPaa]

Start with string "AAAAA". Test it and increment last symbol until it is larger than 'Z'. Then set last symbol to 'A' again and increment second-to last, start again with last. When second to last will be larger than Z, set it to 'A' and inctement previous symbol, etc.

[xHyperionx]

how would I implement that into the code that you posted earlier?

[MiiNiPaa]

Code I posted earlier does completely different thing. It counts frequenvy of letters in entered string and exis only to show int←→char conversion.
Here http://www.cplusplus.com/forum/general/151874/#msg790526 I show how to loop over character range easily.

[xHyperionx]

ok thx m8