| 1 | /* |
| 2 | * Big Integer Library |
| 3 | * Filename: BigIntegerIO.h |
| 4 | * Author: Matt McCutchen |
| 5 | * Version: 2004.1205 |
| 6 | */ |
| 7 | |
| 8 | #include "BigIntegerIO.h" |
| 9 | |
| 10 | std::ostream& operator<<(std::ostream &os, BigUnsigned x) { |
| 11 | if (x.getLength() == 0) |
| 12 | os << '0'; |
| 13 | else { |
| 14 | BigUnsigned ten(10); |
| 15 | |
| 16 | /* |
| 17 | * This buffer is filled with the decimal digits of x. |
| 18 | * sizeof(BigUnsigned::Blk) * x.getLength() is an upper bound on the |
| 19 | * number of bytes in x, and a byte takes at most 3 decimal |
| 20 | * digits, so this is a convenient upper bound. |
| 21 | */ |
| 22 | char *buf = new char[sizeof(BigUnsigned::Blk) * x.getLength() * 3]; |
| 23 | //std::cout << "bufferlength" << sizeof(BigUnsigned::Blk) * x.getLength() * 3<< std::endl; |
| 24 | int bufPos = 0; // first unfilled position |
| 25 | |
| 26 | // While x is not zero... |
| 27 | while (!x.isZero()) { |
| 28 | //std::cout << "bufPos=" << bufPos << std::endl; |
| 29 | // Get next digit |
| 30 | buf[bufPos] = char(int(x % ten) + '0'); |
| 31 | // Remove it from x |
| 32 | x /= ten; |
| 33 | // Next buffer slot |
| 34 | bufPos++; |
| 35 | } |
| 36 | |
| 37 | // Now print the digits to os. |
| 38 | while (bufPos > 0) { |
| 39 | bufPos--; |
| 40 | os << buf[bufPos]; |
| 41 | } |
| 42 | |
| 43 | // Free the buffer and return the stream (as customary) |
| 44 | delete buf; |
| 45 | return os; |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | std::ostream& operator<<(std::ostream &os, BigInteger x) { |
| 50 | switch (x.getSign()) { |
| 51 | case BigInteger::positive: |
| 52 | os << BigUnsigned(x); |
| 53 | break; |
| 54 | case BigInteger::zero: |
| 55 | os << '0'; |
| 56 | break; |
| 57 | case BigInteger::negative: |
| 58 | os << '-' << BigUnsigned(x); |
| 59 | break; |
| 60 | } |
| 61 | return os; |
| 62 | } |