#include <iostream>
#include <vector>
using namespace std;
// descriptions of declared functions listed with implementation
int ProcessInput(const int fromBase, const int toBase, char inputValue[],
const int length);
void ConvertToBase(int decimal, const int inBase, char outPut[]);
double Exponent(const int number, const int exponent);
int main(int argsc, char** argsv)
{
int fromBase(0), toBase(0);
// set bases and initialize vector for storing output until end of input
fromBase = atoi(argsv[1]);
toBase = atoi(argsv[2]);
vector <char *> outPutValues;
int count(0);
while (!cin.eof())
{
// array to hold input value
char inputValue[8] = {' '};
// receive input from keyboard and convert input to decimal and new base
while (cin >> inputValue)
{
int length(strlen(inputValue));
// using dynamic arrays in vector allows for multiple input
// with no output until all input received
outPutValues.push_back(new char[8]);
int decimalValue = ProcessInput(fromBase, toBase, inputValue,
length);
// if the new base is decimal, simply output decimalValue;
// else process the new base and store in an output array;
ConvertToBase(decimalValue, toBase, outPutValues[count]);
count++;
}
for (int c = 0; c < outPutValues.size(); c++)
{
int k(0);
// display only set values of the output array
while ((outPutValues[c][k] == '\0') || (outPutValues[c][k] == '0'))
k++;
while (k < 8)
{
cout << outPutValues[c][k];
k++;
}
cout << endl;
}
}
// free up dynamic arrays
for (int d = 0; d < outPutValues.size(); d++)
delete outPutValues[d];
return 0;
} // end main
// ProcessInput receives the input array and translates the char values
// into a decimal value to be returned to calling function
int ProcessInput(const int fromBase, const int toBase, char inputValue[],
const int length)
{
int exponent(0), decimalValue(0);
for (int j = 0; j < length; j++)
{
exponent = (length - j - 1);
// convert inputValue from char to int to be processed into decimal;
// negative signs are ignored
switch (inputValue[j])
{
case 'a':
case 'A': decimalValue += (10 * Exponent(fromBase, exponent)); break;
case 'b':
case 'B': decimalValue += (11 * Exponent(fromBase, exponent)); break;
case 'c':
case 'C': decimalValue += (12 * Exponent(fromBase, exponent)); break;
case 'd':
case 'D': decimalValue += (13 * Exponent(fromBase, exponent)); break;
case 'e':
case 'E': decimalValue += (14 * Exponent(fromBase, exponent)); break;
case 'f':
case 'F': decimalValue += (15 * Exponent(fromBase, exponent)); break;
case '-': cout << "Negative Number Received. Converted to unsigned int.\n"; break;
default: decimalValue += ((inputValue[j] - '0') * Exponent(fromBase, exponent)); break;
}
}
return decimalValue;
} // end ProcessInput
// ConvertToBase converts the decimal form of a number into
// a new base by dividing the decimal until 0 and
// storing the remainders in the output array
void ConvertToBase(int decimal, const int inBase, char outPut[])
{
int remainder(0);
// char variable used to convert int back into char
// for output
char intToChar('0');
for (int i = 7; i >= 0; i--)
{
remainder = decimal % inBase;
decimal /= inBase;
// account for hex and if remainder is an int,
// store as char in output array using char intToChar
switch (remainder)
{
case 10: outPut[i] = 'A'; break;
case 11: outPut[i] = 'B'; break;
case 12: outPut[i] = 'C'; break;
case 13: outPut[i] = 'D'; break;
case 14: outPut[i] = 'E'; break;
case 15: outPut[i] = 'F'; break;
default: for (int j = 0; j < remainder; j++) {intToChar++;}
outPut[i] = intToChar;
intToChar = '0';
break;
}
}
} // end ConvertToBase
// converts input to decimal form by multiplying
// each number place by its base and exponent
double Exponent(const int number, const int exponent)
{
double value(1);
for (int i = 1; i <= exponent; i++)
value *= number;
return value;
} // end Exponent