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#include <iostream> // for cout, if needed for debugging
#include <fstream> // for file stream support
#include <iomanip> // for formatting support
#include <cmath> // for standard math functions, if needed
#include <string> // for character string type
using namespace std; // put all of that in scope
const int totalInt = 20;
void readpermutation (ifstream& Data, int readInt[], int idx);
void permutation (int readInt[], const int inverse[], int idx, int newIdx);
void readNumChar (ifstream& Data, int numChar);
void readMessage (ifstream& Data, char readChar[], int idx);
void decryption (char readChar[], int readInt[], int inverse[], char finished[],
int idx, int newIdx);
void firstoutput (ofstream& Log, int numChar);
void secondoutput (ofstream& Log, int readInt[]);
void lastoutput (ofstream& Log, char finished[]);
int main () {
int readInt[totalInt]; //reads and creates first array
int inverse [totalInt]; //creates new array for decryption
int numChar = 0; //number of integers given in the input
char readChar[totalInt]; //array of the code needing decryption
char finished[totalInt]; //final outputted array
int sumChar = 0; //sum of characters
int idx = 0; //index number
int newIdx = 0; //new index number
ifstream Data("Scrambled.txt"); // opens the input file
ofstream Log("Unscrambled.txt"); // opens the output file
readNumChar (Data, numChar); //read number of characters in the input
firstoutput (Log, numChar); //first output
readpermutation (Data, readInt, idx); //reat the permutation array
secondoutput (Log, readInt); //second output
readMessage (Data, readChar, idx); //read first 20 characters of the message
while ( Data && sumChar < numChar) {
for (idx = 0; idx < totalInt; idx++) {
permutation (readInt, inverse, idx, newIdx);
decryption (readChar, readInt, inverse, finished, idx, newIdx);
readMessage (Data, readChar, idx);
}
idx = 0;
sumChar = sumChar + 20;
}
return 0;
}
//Function definitions:
void readpermutation (ifstream& Data, int readInt[], int idx) { //read first line of digits
Data.ignore(INT_MAX, '\n'); // skip first line of input
Data >> readInt[idx]; // reads list of integers
}
void permutation (int readInt[], int inverse[],int idx, int newIdx) {
readInt[idx] = newIdx;
inverse[newIdx] = idx;
}
void decryption (char readChar[], int readInt[], int inverse[], char finished[], int idx, int newIdx) {
readChar[idx] = readInt[idx];
readChar[newIdx] = inverse[newIdx];
}
void readNumChar (ifstream& Data, int numChar) {
Data.ignore(INT_MAX, '\n'); //skip next 2 lines
Data.ignore(INT_MAX, '\n');
Data >> numChar; //read how many characters in the message
}
void readMessage (ifstream& Data, char readChar[], int idx) {
Data.ignore(INT_MAX, '\n'); // skip next 2 lines
Data.ignore(INT_MAX, '\n');
Data >> readChar[idx];
idx = 0;
}
void firstoutput (ofstream& Log, int numChar) {
Log << "***************************************************************************"
<< "Decrypting " << numChar << " characters" << endl;
}
void secondoutput (ofstream& Log, int readInt[]){
Log << "Using: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19";
Log << endl;
Log << " " << setw(3) << readInt << endl;
}
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