Dart BigInt

// Recommended: Parsing from a string prevents 64-bit overflow errors
BigInt largeBase10 = BigInt.parse('922337203685477580899999');

// Automatically detects and parses hexadecimal if prefixed with '0x'
BigInt largeHex = BigInt.parse('0x1fffffffffffff123456789');

// Parsing without a prefix requires explicitly specifying the radix
BigInt explicitHex = BigInt.parse('1fffffffffffff123456789', radix: 16);
BigInt binaryValue = BigInt.parse('101010', radix: 2);

// Converting from an existing 64-bit int or double
BigInt fromNativeInt = BigInt.from(42);

// Pre-defined constants
BigInt zero = BigInt.zero;
BigInt one = BigInt.one;
BigInt two = BigInt.two;

BigInt a = BigInt.parse('100000000000000000000');
BigInt b = BigInt.from(5);

// Arithmetic
BigInt sum = a + b;
BigInt difference = a - b;
BigInt product = a * b;
BigInt quotient = a ~/ b;     // Truncating integer division, returns BigInt
double floatQuotient = a / b; // Standard division, returns double
BigInt modulo = a % b;

// Bitwise
BigInt shifted = a << 2;
BigInt bitwiseAnd = a & b;

// Relational
bool isGreater = a > b;

BigInt val = BigInt.parse('256');

// Inspection
bool isEven = val.isEven;
bool isNegative = val.isNegative;
int sign = val.sign;      // Returns -1, 0, or 1
int bits = val.bitLength; // Minimum number of bits required to store the value

// Mathematical operations
BigInt power = val.pow(3);
BigInt greatestCommonDivisor = val.gcd(BigInt.from(128));

// Downcasting
int nativeInt = val.toInt();          // Truncates if value exceeds 64 bits
double nativeDouble = val.toDouble(); // Loses precision if value exceeds 53 bits