Need help with my code. My algorithm seems to be able to work when doing the enc

Question

Need help with my code. My algorithm seems to be able to work when doing the encryption. Except, only for the first one. I think there is something wrong when i input from the file and my if statements. Please can you help me solve this problem.

CODE:

#include <iostream>
#include <fstream>

using namespace std;

void editDigits(int number, int storageArray[], ofstream &outData, int &i)
{
    int n = 1;

    while(number/n>=10)
    {
        n = n*10;
    }

   while(n!=0)
    {
            int digit = number/n;
            storageArray[i] = (digit+8)%10;
            number = number%n;
            i = i + 1;
            n=n/10;
    }
}

void swapDigits(int number,int storageArray[], ofstream &outData)
{
    int tempArray[4] = {0,0,0,0};

    tempArray[0] = storageArray[0];
    tempArray[1] = storageArray[2];
    tempArray[2] = storageArray[1];
    tempArray[3] = storageArray[3];

    storageArray[0] = tempArray[1];
    storageArray[2] = tempArray[0];
    storageArray[1] = tempArray[3];
    storageArray[3] = tempArray[2];

    outData << storageArray[0] << storageArray[1] << storageArray[2] << storageArray[3] << storageArray[4] << endl;

}

int main()
{
    ifstream inData;
    inData.open("input.txt");
    ofstream outData;
    outData.open("output.txt");

    int number = 0;
    int storageArray[100];
    char unknownoperation;
    int i = 0;

    while (!inData.eof())
    {

    inData >> unknownoperation >> number;

    if (unknownoperation == 'e')
    {
        editDigits(number,storageArray,outData,i);
        if (i>5)
        {
        outData << "-1" << endl;
        }
        else
        {
            swapDigits(number,storageArray,outData);
        }
    }

    else if (unknownoperation == 'E')
    {
        editDigits(number,storageArray,outData,i);
        if (i>5)
        {
        outData << "-1" << endl;
        }
        else
        {
            swapDigits(number,storageArray,outData);
        }

    }
    else
    {
        outData << "-1" << endl;
    }

    }

    return 0;
}

You are required to implement a simple encryption algorithm that operates on five-digit integer values. The encryption algorithm is: . Replace each digit by (the sum of that digit plus 8) modulus 10. . Then, swap the first digit with the third. » Lastly, swap the second digit with the fourtlh . The resulting five-digit number is the encrypted value You are required to write a computer programme in C++ that reads in a list of operations and numbers from a file and writes the results to an output file.

Explanation / Answer

Mistake was in line  while (!inData.eof()) as you are using i as reference variable and updating it.

So after encrytion value of i will 6 and It will be remain same through out complete file read.

So write i=0, in first line of while loop.

Please find the update code with that small modification only.

Please see below part of code carefully

while (!inData.eof())
{

//variable must be 0 before each encryption operation start
i=0;

***********************************************************************

#include <iostream>
#include <fstream>

using namespace std;

void editDigits(int number, int storageArray[], ofstream &outData, int &i)
{
int n = 1;

while(number/n>=10)
{
n = n*10;
}

while(n!=0)
{
int digit = number/n;
storageArray[i] = (digit+8)%10;
number = number%n;
i = i + 1;
n=n/10;
}
}

void swapDigits(int number,int storageArray[], ofstream &outData)
{
int tempArray[4] = {0,0,0,0};

tempArray[0] = storageArray[0];
tempArray[1] = storageArray[2];
tempArray[2] = storageArray[1];
tempArray[3] = storageArray[3];

storageArray[0] = tempArray[1];
storageArray[2] = tempArray[0];
storageArray[1] = tempArray[3];
storageArray[3] = tempArray[2];

outData << storageArray[0] << storageArray[1] << storageArray[2] << storageArray[3] << storageArray[4] << endl;

}

int main()
{
ifstream inData;
inData.open("input.txt");
ofstream outData;
outData.open("output.txt");

int number = 0;
int storageArray[100];
char unknownoperation;
int i = 0;

while (!inData.eof())
{

//variable must be 0 before each encryption operation start
i=0;

inData >> unknownoperation >> number;

if (unknownoperation == 'e')
{
editDigits(number,storageArray,outData,i);
if (i>5)
{
outData << "-1" << endl;
}
else
{
swapDigits(number,storageArray,outData);
}
}

else if (unknownoperation == 'E')
{
editDigits(number,storageArray,outData,i);
if (i>5)
{
outData << "-1" << endl;
}
else
{
swapDigits(number,storageArray,outData);
}

}
else
{
outData << "-1" << endl;
}

}

return 0;
}

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