A.M. Rowsell
97018305fd
Code is licensed under the MPLv2. Changed the makefile to, by default, optimize to level 3. make debug will remove optimization and add gdb debugging symbols, which slows output down quite a bit. Removed an assertion leftover from bug squashing.
65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
#include <iostream>
|
|
#include <cmath>
|
|
#include <cassert>
|
|
#include "Spigot.hpp"
|
|
|
|
Spigot::Spigot(int requestedNumDigits) {
|
|
/* create list for number of digits times 10 / 3 */
|
|
this->spigotListLength = (requestedNumDigits * 10) / 3;
|
|
this->spigotList.resize(this->spigotListLength, 2); // list is initialized with all 2
|
|
this->carry = 0;
|
|
return;
|
|
}
|
|
|
|
void Spigot::pump(void) {
|
|
int tempPreDigit = 0;
|
|
int j = this->spigotListLength - 1;
|
|
int i = j;
|
|
while(i >= 0) {
|
|
this->spigotList[i] *= 10;
|
|
i--;
|
|
}
|
|
this->carry = 0;
|
|
i = j;
|
|
// note this does *not* handle the i=0 case
|
|
while(i > 0) {
|
|
this->spigotList[i] += this->carry;
|
|
this->carry = (this->spigotList[i] / (i * 2 + 1)) * i;
|
|
this->spigotList[i] = this->spigotList[i] % (i * 2 + 1);
|
|
i--;
|
|
}
|
|
// special case of i = 0
|
|
this->spigotList[0] += this->carry;
|
|
tempPreDigit = this->spigotList[0] / 10;
|
|
this->spigotList[0] -= (tempPreDigit * 10);
|
|
|
|
try {
|
|
// handle the cases depending on the tempPreDigit
|
|
if(tempPreDigit >= 0 && tempPreDigit <= 8) {
|
|
// output all predigits
|
|
long unsigned pdLen = this->preDigits.size();
|
|
for(long unsigned int j = 0; j < pdLen; j++) {
|
|
std::cout << this->preDigits.back() << std::flush;
|
|
this->preDigits.pop_back();
|
|
}
|
|
this->preDigits.insert(this->preDigits.begin(), tempPreDigit);
|
|
|
|
} else if(tempPreDigit == 9) {
|
|
this->preDigits.insert(this->preDigits.begin(), tempPreDigit);
|
|
} else if(tempPreDigit == 10) {
|
|
tempPreDigit = 0;
|
|
long unsigned pdLen = this->preDigits.size();
|
|
for(long unsigned int j = 0; j < pdLen; j++) {
|
|
std::cout << (this->preDigits.back() + 1) % 10 << std::flush;
|
|
this->preDigits.pop_back();
|
|
}
|
|
this->preDigits.insert(this->preDigits.begin(), tempPreDigit);
|
|
} else {
|
|
std::cout << "We should never have gotten here -- shit has hit the fan!" << std::endl;
|
|
}
|
|
} catch (int e) {
|
|
std::cout << "An exception " << e << " occurred." << std::endl;
|
|
}
|
|
return;
|
|
}
|