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add demonstration
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‎README.md

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The project is very flexible, but still very simple to use.
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### Demonstration
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See examples in `demo/` folder. GNU `make` with build three versions:
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- demo_hand: using [HandBigInt.hpp](./src/HandBigInt.hpp) (slow and the simplest to use)
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- demo_cshand: using [BigInteger.h](./src/BigInteger.h) + [BigIntegerHand.cpp](./src/BigIntegerHand.cpp) (slow)
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- demo_csgmp: using [BigInteger.h](./src/BigInteger.h) + [BigIntegerGMP.cpp](./src/BigIntegerGMP.cpp) (fast)
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Example from `./demo_cshand` (print `-1`, `128` and `2^128`):
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```
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demonstration for csBigInteger (Engine: 'HandBigInt')
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usage: <operation> <enter> <number> <enter> <number <enter>
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avaliable operations are: + - / * % ^ > < 0x 0b (0x and 0b are conversions to hex big endian and binary)
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please type the operation: 0x
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expects 1 number(s)
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please type first number (in decimal, or unsigned hex with prefix 0x, or binary prefix 0b):-1
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number is (decimal) '-1'
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conversion: 0xff <----- Negative values have MSb set to one
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please type the operation: 0x
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expects 1 number(s)
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please type first number (in decimal, or unsigned hex with prefix 0x, or binary prefix 0b):128
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number is (decimal) '128'
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conversion: 0x0080 <----- This zero on the left is correct and necessary for csBigInteger
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please type the operation: ^
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expects 2 number(s)
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please type first number (in decimal, or unsigned hex with prefix 0x, or binary prefix 0b):2
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number is (decimal) '2'
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please type second number (in decimal):128
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number is '128'
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result: 340282366920938463463374607431768211456
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```
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### Using Hand Implementation
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Just include the Single Header solution [src/HandBigInt.hpp](src/HandBigInt.hpp).

‎demo/.gitignore

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demo_*

‎demo/cs_demo.cpp

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#include <assert.h>
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#include <iostream>
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#include "BigInteger.h"
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using namespace csbiginteger;
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int
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main()
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{
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std::cout << "demonstration for csBigInteger (Engine: '" << BigInteger::getEngine() << "')" << std::endl;
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std::cout << "usage: <operation> <enter> <number> <enter> <number <enter>" << std::endl;
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std::cout << "avaliable operations are: + - / * % ^ > < 0x 0b (0x and 0b are conversions to hex big endian and binary)" << std::endl;
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while (true) {
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std::cout << std::endl << "please type the operation: ";
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std::string op;
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std::cin >> op;
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int num = 0;
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if ((op == "+") || (op == "-") || (op == "/") || (op == "*") || (op == "%") || (op == "^") || (op == ">") || (op == "<"))
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num = 2;
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if ((op == "0x") || (op == "0b"))
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num = 1;
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assert(num > 0);
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std::cout << "expects " << num << " number(s)" << std::endl;
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std::cout << "please type first number (in decimal, or unsigned hex with prefix 0x, or binary prefix 0b):";
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std::string sbig;
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std::cin >> sbig;
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BigInteger big1(sbig);
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std::cout << "number is (decimal) '" << big1.ToString(10) << "'" << std::endl;
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if (num > 1) {
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std::cout << "please type second number (in decimal):";
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std::string sbig2;
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std::cin >> sbig2;
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BigInteger big2(sbig2);
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std::cout << "number is '" << big2.ToString(10) << "'" << std::endl;
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std::cout << "result: ";
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if (op == "+")
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std::cout << (big1 + big2).ToString(10) << std::endl;
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if (op == "-")
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std::cout << (big1 - big2).ToString(10) << std::endl;
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if (op == "/")
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std::cout << (big1 / big2).ToString(10) << std::endl;
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if (op == "*")
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std::cout << (big1 * big2).ToString(10) << std::endl;
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if (op == "%")
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std::cout << (big1 % big2).ToString(10) << std::endl;
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if (op == "^")
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std::cout << BigInteger::Pow(big1, big2.toInt()).ToString(10) << std::endl;
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if (op == ">")
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std::cout << (big1 > big2) << std::endl;
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if (op == "<")
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std::cout << (big1 < big2) << std::endl;
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continue;
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}
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std::cout << "conversion: ";
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if (op == "0x")
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std::cout << big1.ToString(16) << std::endl;
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if (op == "0b")
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std::cout << big1.ToString(2) << std::endl;
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}
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return 0;
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}

‎demo/hand_demo.cpp

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#include <assert.h>
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#include <iostream>
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#include "HandBigInt.hpp"
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int
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main()
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{
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std::cout << "demonstration for HandBigInt" << std::endl;
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std::cout << "usage: <operation> <enter> <number> <enter> <number <enter>" << std::endl;
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std::cout << "avaliable operations are: + - / * % ^ > < 0x 0b (0x and 0b are conversions to hex big endian and binary)" << std::endl;
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while (true) {
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std::cout << "please type the operation: ";
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std::string op;
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std::cin >> op;
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int num = 0;
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if ((op == "+") || (op == "-") || (op == "/") || (op == "*") || (op == "%") || (op == "^") || (op == ">") || (op == "<"))
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num = 2;
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if ((op == "0x") || (op == "0b"))
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num = 1;
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assert(num > 0);
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std::cout << "expects " << num << " number(s)" << std::endl;
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std::cout << "please type first number (in decimal, or unsigned hex with prefix 0x, or binary prefix 0b):";
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std::string sbig;
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std::cin >> sbig;
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HandBigInt big1;
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if ((sbig.length() >= 2) && (sbig[0] == '0') && (sbig[1] == 'x'))
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big1 = HandBigInt::fromUnsignedHex(sbig);
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else if ((sbig.length() >= 2) && (sbig[0] == '0') && (sbig[1] == 'b'))
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big1 = HandBigInt::fromUnsignedBin(sbig);
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else
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big1 = HandBigInt(sbig);
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std::cout << "number is (decimal) '" << big1.toString() << "'" << std::endl;
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if (num > 1) {
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std::cout << "please type second number (in decimal):";
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std::string sbig2;
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std::cin >> sbig2;
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HandBigInt big2(sbig2);
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std::cout << "number is '" << big2.toString() << "'" << std::endl;
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std::cout << "result: ";
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if (op == "+")
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std::cout << (big1 + big2).toString() << std::endl;
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if (op == "-")
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std::cout << (big1 - big2).toString() << std::endl;
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if (op == "/")
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std::cout << (big1 / big2).toString() << std::endl;
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if (op == "*")
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std::cout << (big1 * big2).toString() << std::endl;
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if (op == "%")
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std::cout << (big1 % big2).toString() << std::endl;
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if (op == "^")
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std::cout << HandBigInt::pow(big1, big2.get_ui()).toString() << std::endl;
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if (op == ">")
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std::cout << (big1 > big2) << std::endl;
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if (op == "<")
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std::cout << (big1 < big2) << std::endl;
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continue;
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}
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std::cout << "conversion: ";
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if (op == "0x")
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std::cout << big1.get_str(16) << std::endl;
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if (op == "0b")
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std::cout << big1.get_str(2) << std::endl;
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}
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return 0;
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}

‎demo/makefile

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all: demo_hand demo_cshand demo_csgmp
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demo_hand: hand_demo.cpp ../src/HandBigInt.hpp
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g++ -fsanitize=address -Wfatal-errors -pedantic --std=c++17 -I../src hand_demo.cpp -o demo_hand
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demo_cshand: cs_demo.cpp
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g++ -fsanitize=address -Wfatal-errors -pedantic --std=c++17 -I../src cs_demo.cpp ../src/BigIntegerHand.cpp -o demo_cshand
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demo_csgmp: cs_demo.cpp
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g++ -fsanitize=address -Wfatal-errors -pedantic --std=c++17 -I../src cs_demo.cpp ../src/BigIntegerGMP.cpp -o demo_csgmp -lgmp -lgmpxx
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clean:
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rm -f demo_*

‎src/BigInteger.h

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cs_vbyte _data;
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public:
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static std::string getEngine();
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// size in bytes
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int Length() const
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{

‎src/BigIntegerGMP.cpp

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const BigInteger BigInteger::MinusOne = BigInteger(-1);
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const BigInteger BigInteger::Error = error();
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std::string
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BigInteger::getEngine()
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{
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return "GMP";
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}
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const BigInteger
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BigInteger::error()
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{

‎src/BigIntegerHand.cpp

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const BigInteger BigInteger::MinusOne = BigInteger(-1);
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const BigInteger BigInteger::Error = error();
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std::string
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BigInteger::getEngine()
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{
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return "HandBigInt";
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}
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const BigInteger
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BigInteger::error()
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{

‎src/BigIntegerMono.cpp

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const BigInteger BigInteger::MinusOne = BigInteger(-1);
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const BigInteger BigInteger::Error = error();
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std::string
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BigInteger::getEngine()
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{
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return "Mono";
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}
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const BigInteger
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BigInteger::error()
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{

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