Very larger integer calulator

This is a discussion on Very larger integer calulator within the C++ Programming forums, part of the General Programming Boards category; I have to write a C++ program to add,multiply, and divide very large integer numbers of unlimited size. The book ...

  1. #1
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    Very larger integer calulator

    I have to write a C++ program to add,multiply, and divide very large integer numbers of unlimited size. The book suggest breaking the number up like this 9876543210987654 =
    987 765 432 109 876 54 ..... and handling it like that I am totally lost on how to do this please help !

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    Search Google for big int class and you will get lots of pre-written classes that overload the operators. You can look at these to see where to start. Basically you can store a num of any length in a string and write functions to do the math on them, all wrapped inside a class with the usual overloaded ops.
    -d-
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  3. #3
    Guest Sebastiani's Avatar
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    most mathematical operations of a computer involve addition on some level - subtraction becomes the addition of numbers in two's complement, multiplication repetitive addition, and division repetitive subtraction. here's a small set of classes that add binary bits just like a computer:

    Code:
    namespace adder {
     struct result {
      result & set(bool _sum, bool _carry) {
       sum = _sum, carry = _carry;
       return *this;
       }
      void clear(void) {
       set(0, 0);
       }
      result(bool _sum = 0, bool _carry = 0) {
       set(_sum, _carry);
       }
      bool sum, carry;
     };
     struct halfadder : result {
      result & add(bool a, bool b) {
       sum = xor_gate(a, b);
       carry = and_gate(a, b);
       return *this;
       }
      halfadder(bool a = 0, bool b = 0) {
       add(a, b);
       }
     };
     struct fulladder : halfadder {
      result & add(bool a, bool b, bool carry_in) {
       halfadder first(a, b);
       halfadder::add(carry_in, first.sum);
       carry = or_gate(carry, first.carry);
       return *this;
       }
      fulladder(bool a = 0, bool b = 0, bool carry_in = 0) {
       add(a, b, carry_in);
       }
     };
    } // namespace adder
    good luck!
    Code:
    if( numeric_limits< byte >::digits != bits_per_byte )
        error( "program requires bits_per_byte-bit bytes" );
    24bbs.cpp

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