C++ :: Deciphering Unknown Shifted Caesar Cipher Text File
May 25, 2014
The assignment is to open an encrypted file, count the occurrence of each alphabetic character in the file. find the highest occurring letter and use that to find the shift, then apply the sift to the file in order to decipher and then print out the deciphered txt.
#include <fstream>
#include <iostream>
#include <string>
using namespace std;
int main(){
string word;
ifstream txt;
int arr[26] = { 0 };
[Code] ....
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Aug 1, 2013
I get the error of not declaring "text" "exit" but I how do I declared those variables, even if they cause problem to file... How can I output the decipher file in a new text...?
#include <iostream>
#include <iomanip>
#include <string>
#include <sstream>
#include <fstream>
#include <math.h>
[Code] ....
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Mar 29, 2015
I have managed to print out the encrypted text from the console, however it doesnt decrypt correctly and isn't returning the correct key. I can't seem to find the error that is causing the decrypted text from printing correctly. When I try to decrypt the text it changes it completely as well.
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "rotUtils.h"
bool solved( char decodearr[], char dictarr[][30], int size1, int size2){
char* compared;
bool result = false;
for(int j = 0; j < size2; j++){
[code]....
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Dec 11, 2013
I am making a simple caesar cypher with a 2D array. I have to make a function for the key shift so
key=5
ABCDEFGHIJKLMNOPQRSTUVWXYZ
FGHJKL...ABCDE
Function Name: Key_Array
This function uses the random key value to make a key array
Passed: value = random key value
Returns: alphabet = rearranged alphabet
[Code] .....
I am having trouble outputting the rearranged alphabet to the screen also.
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Dec 5, 2014
I am struggling to write a code about caesar cipher shift and using ascii code with it. For example letter b should be replaced with the letter c and using the ascii code it should be from 98 to 99 and so on..
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May 1, 2013
So I'm making setTimeout and setInterval functions.
I have this remember function (that is part of Timing class) which takes a function pointer and a void pointer, which are remembered in that object.
Another (timing) function of that object is called in every loop of the program and when specific time passes that function calls the remembered function whit the remembered void pointer as argument.
The problem is that the functions that need to be called require unknown multiple parameters, so what I need to do is make a new class that will store the needed arguments. I make the function that needs to be called and that storage object and pass pointers to them to my remember function, when the remembered function is called it stores the data from storage object in new variables and dose it's thing.
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Nov 4, 2014
For an assignment I have to write a program which basically converts 8 bit binary numbers to ASCII and outputs the assembled text. Here's the catch:
The 8-bit binary numbers are provided by some external file (which only contains 8 bit binary numbers); the name and hence length is not known. The external file is called with a pointer upon execution
(./"conversion program" < external_file.in).
I'm getting the 8 bits as a string, calculate/convert decimals, output char type. HOW do I know when to stop the loop? If I just pick an insanely high number I get random stuff at the end; no boundaries obviousely lead to an infinite loop. Can I determine the lenght of this random ext file somehow nonetheless?
Is it possible to create a vector which dynamically adjusts itself until there are no more strings = end of the file?
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Apr 1, 2013
If I don't assign the icon to my executable file (f.e. it's a DOS application), or I have some unknown extension in the file, Windows Explorer assigns the icon to this file.
Is there a way to somehow get this icon? Either from the registry or by any other means.
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Mar 1, 2013
so i need to encrypt a txt document using Caesar encryption. however i don't know how to open a txt and shift the keys into a new txt. the program has to ask the user for the number it should shift. Using arrays, if else. i also need to make a menu so i am using switch.
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Mar 11, 2015
I was assigned to make a vigenere cipher using the function void vegenere(char* to_encrypt, char* key, char* encrypted) I got it to work for the encryption but i have to be able to decrypt the phrase too. I was assigned to write in a flag which indicated encryption or decryption. I tried to implement this but now it wont decrypt and i dont know why, all it does is put the same copy of decryption (which is really encrypted) multiple times until it crashes.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
void decrypt(char *to_encrypt, char *key);
enum flag{encryption = 1, decryption = -1};
[Code] ....
Ok i found my dumb error of putting decrypt on an infinite loop which i fixed by putting it into the if statement after the encryption output. However now it says that the encrypted and decrypted outputs are identical without decrypting the ciphertext
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Mar 1, 2013
So I am trying to make a simple cipher but can't see a pattern between the letters.
Convert:
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
To:
E I L Q A G F R B N T C P J Z M D H X K Y W V S U O
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Jan 4, 2014
I finished my Enigma cipher simulator...how should I write the error handling code? Should I throw an exception in main, or in the Enigma ctor and Encrypt() fn when the user enters a non-alphanumeric character?
Rotor.hpp
Code:
#ifndef ROTOR_HPP
#define ROTOR_HPP
class Rotor {
public:
Rotor(char pos='A');
Rotor(const Rotor & rhs);
Rotor& operator=(const Rotor& rhs);
[Code] ....
Output
Code:
Enter rotor settings:
ABCDEFGHIJ
Enter cleartext:
HELLO WORLD
Ciphertext:
0O258 SGY5V
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Nov 29, 2014
Code software that, from an original text file, generate another file with the text content in upper case.For exemple:
entrence:
luke
tom
alex
outings:
LUKE
TOM
ALEX
My code so far:
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
}
[code]....
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Jun 5, 2014
I want to make a program that opens a text file and checks the usernames listed in the text files to see if the names are registered on a site such as twitter. How easy would this be to make, what things would I need to know?
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May 31, 2013
I am trying to get text file and read only first 100 lines of the text content using c/c++. how can i do it?
is it something like string line;
getline(stream,line);
??
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Aug 30, 2013
I have a huge text file in following format:
{Bunch of text
.
.
}
[Code].....
I want to extract Text1, Text2, Text3, Text4,..., Text600 in the output file. How can i achieve this?
/* BTW, I am not getting my homework done here. I am an ex-programmer, who has now moved to marketing for some time now, and today, I encountered this problem, which I believe can be solved easily through programming. */
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Aug 31, 2014
i want to create 100 gmail accounts instantaneously....what i want from you guys is i have written a program that create a text file i want that once i give the program the imput of 1 it should delete the first 3 lines from the file i.e. the first account details coz that is already been created and shift the rest of it 3 lines upwards after that i'll write a javascript that will automatically fill and create the accounts with those names in web browser.....my lil program is here:
#include <stdio.h>
#include <conio.h>
main()
[Code]....
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Aug 2, 2014
I have a text file called (Test.txt) with the following text:
This is line one
This is line two
This is line three
How do I go about writing a program that will print a line of text (e.g. "This in line two" on the console screen?
All I can seem to do is display the entire text file.
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Feb 18, 2014
I try to write code for one problem which is worked with the matrix.I have written in specific size 5 by 5 and I know the general formula for these matrix based on dimension,I want to write a general form that take the matrix size and then create my favor matrix.However,when I write like below the following error is appeared
int m;
cin>>m;
int A[m][m];
Error: m must be constant
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Feb 27, 2015
I have the following code
#include <stdio.h>
#include <stdlib.h>
#include <postgresql/libpq-fe.h>
[Code].....
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Dec 2, 2012
i dont usually write console programs, and i cant seem to find out how one parses an unknown number of arguments with cin.
the program receives an unknown amount of integers in stdin, and i need to parse them withouth hanging.
Unfortunately, stdin is a async. stream and blocks, if it doesnt find any integers left.
I cant use peek() or seek() either, as both are async, too, (which makes me wonder what their exact use is?).
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Feb 2, 2013
I'm doing some file input/output work here in C and received this warning during compilation (GCC). My research indicates that this error is in response to white space or a character cancellation function or something like that. I'm not 100% sure exactly what it means. My code works fine, but the following warning does appear.
Code:
warning: unknown escape sequence: '40'
Here's my code (excluding a bunch of comments at the bottom of the file).
Code:
#include <stdio.h>
int main(void){
FILE *file;
file = fopen("Running Practice.c", "a");
fprintf(file, "Testing...
");
fclose(file);
}
I believe the error I received has to do with either the ' ' I used when appending text to my file, or something to do with there being a space in the file name itself.
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Jan 23, 2013
I want my program to be able to read text files in the format:
number number
number number
number number...
and so on, so there are two columns of values. The problem I'm having is, there are a lot of numbers in the file, and it can vary. The program needs to read the numbers, put one column into one array, and the other in another, perform some operations on it all, and eventually pop out two different arrays. In other words, after I've got these arrays, I don't need them for much longer. I was hoping I could dynamically allocated some arrays to store the numbers and just free them as soon as I'm done with them.
If the file wasn't of such variable size or if it was guaranteed to be under a certain number of variables, I would have used:
Code:
while ( fscanf(input, "%lf %lf
", &col_1[], &col_2[]) == 2 )
{
no_rows++;
}
The problem is I want to allocate "no_rows" as the array size, which I don't have until after I have read the file.
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Sep 15, 2014
I call a function that returns a string, and I can print it out fine, but I want to test the result of the function to see if it returns 0. But I can't just call the function again (GetNextToken(b)) because it will generate a different token. I can't allocate space for the string because I'm not sure what the size of the returned string is going to be.
Basically I want to see if the GetNextToken(b) returns 0, and if it doesn't then print the string. And running GetNextToken(b) again will give a different result.
Code:
int main(int argc, char **argv) {
SomeStruct* b = CreateStruct(argv[1],argv[2]);
printf("HERE %s", GetNextToken(b));
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Mar 2, 2015
I have an assignment where I am trying to get the frac bits of a IEEE number representation. The number of exp and frac bits are given as parameters from the main, but I am unsure what bit mask to use as a one-size-fits mask.
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Mar 27, 2013
I manage to split this str = "abc,def,123"
to s1 = "abc", s2 = "def", s3 = "123" with this piece of code using find and substr.
string str, s1, s2, s3;
getline(cin, str);
unsigned pos1 = str.find(",");
[Code] ....
But what should I do if the len of the string is unknown ?
For example, str = "abc,def,123,ghi,jkl,456,mno" and so on...
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