/BigInt

A Big Integer Class for Cpp

Primary LanguageC++

BigInt

Big Integer class for Cpp

BigInteger class is used for mathematical operation which involves very big integer calculations that are outside the limit of all available primitive data types.

🚧 Work in progress 🚧

Contents

Usage

  1. Download the bigInt.cpp file to a location under your include path. Then #include it in your code:

    #include "BigInt.cpp"   // the actual path may vary

  2. Create objects of the BigInt class, and do what you got to do!

    bigInt big1 = 1234567890, big2;
big2 = "9876543210123456789098765432101234567890";

std::cout << big1 * big2 * 123456 << "\n";
// Output: 1505331490682966620443288524512589666204282352096057600

Features

Operators

  • Assignment: =

    The second operand can either be a bigInt, an integer (up to long long) or a string (std::string or a string literal).

    big1 = 1234567890;
big1 = "123456789012345678901234567890";
big1 = big2;

  • Unary arithmetic: +, -

    big1 = +big2;   // doesn't return the absolute value
big1 = -big2;

  • Binary arithmetic: +, -, *, /, %

    One of the operands has to be a bigInt and the other can be a bigInt, an integer (up to long long) or a string (std::string or a string literal).

    big1 = big2 + 1234567890;
big1 = big2 - "123456789012345678901234567890";
big1 = big2 * big3;
big1 = 1234567890 / big2;
big1 = "123456789012345678901234567890" % big2;

  • Arithmetic-assignment: +=, -=, *=, /=, %=

    The second operand can either be a bigInt, an integer (up to long long) or a string (std::string or a string literal).

    big1 += big2;
big1 -= 1234567890;
big1 *= "123456789012345678901234567890";
big1 /= big2;
big1 %= 1234567890;

  • Increment and decrement: ++, --

    Increment and Decrement can be done as it is done with general integer types of variables.

    big1 = ++big2;   // pre-increment
big1 = --big2;   // pre-decrement

big1 = big2++;   // post-increment
big1 = big2--;   // post-decrement

  • Relational: <, >, <=, >=, ==, !=

    One of the operands has to be a bigInt and the other can be a bigInt, an integer (up to long long) or a string (std::string or a string literal).

    if (big1 < 1234567890
    or big1 > "123456789012345678901234567890"
    or big1 <= big2
    or 1234567890 >= big1
    or "123456789012345678901234567890" == big1
    or big1 != big3) {
    ...
}

  • I/O stream: <<, >>

    std::cout << big1 << ", " << big2 << "\n";
output_file << big1 << ", " << big2 << "\n";

std::cin >> big1 >> big2;
input_file >> big1 >> big2;

Credit

This Big Int class was created by sujon hasan and farid islam