C / C++ / MFC

//hugeint.cpp<br />
#include "cstring"<br />
#include "hugeint.h"<br />
<br />
// Conversion constructor<br />
HugeInt::HugeInt( long val )<br />
{<br />
   int i; <br />
<br />
   for ( i = 0; i <= 29; i++ )<br />
      integer [i] = 0;   // initialize array to zero<br />
<br />
   for ( i = 29; val != 0 && i >= 0; i-- ) <br />
   {<br />
      integer[i] = val % 10;<br />
      val /= 10;<br />
   }<br />
}<br />
HugeInt::HugeInt( char *string )<br />
{<br />
   int i, j;<br />
<br />
   for ( i = 0; i <= 29; i++ )<br />
      integer[i] = 0;<br />
<br />
   for ( i = 30 - strlen( string ), j = 0; i <= 29; i++, j++ )<br />
      if (isdigit( string[j] ))<br />
         integer[i] = string[j] - '0';<br />
}<br />
// Addition<br />
HugeInt HugeInt::operator+( HugeInt &op2 )<br />
{<br />
   HugeInt temp;<br />
   int carry = 0;<br />
<br />
   for ( int i = 29; i >= 0; i-- ) <br />
  {<br />
      temp.integer[i] = integer[i] + <br />
                          op2.integer[i] + carry;<br />
<br />
      if ( temp.integer[i] > 9 ) {<br />
         temp.integer[i] %= 10;<br />
         carry = 1;<br />
      }<br />
      else<br />
         carry = 0;<br />
   }<br />
<br />
   return temp;<br />
}<br />
// Addition<br />
HugeInt HugeInt::operator+( int op2 )<br />
   { return *this + HugeInt( op2 ); }<br />
<br />
// Addition<br />
HugeInt HugeInt::operator+( char *op2 )<br />
   { return *this + HugeInt( op2 ); }<br />
<br />
ofstream& operator << ( ofstream &output, HugeInt &num )<br />
{<br />
   int i;<br />
<br />
   for ( i = 0; ( num.integer[i] == 0 ) && ( i <= 29 ); i++ ); // skip leading zeros<br />
if ( i == 30 )<br />
      output << 0;<br />
   else<br />
      for ( ; i <= 29; i++ )<br />
         output << num.integer[i];<br />
<br />
   return output;<br />
}<br />
<br />
//hugeint.h<br />
#include <iostream><br />
<br />
using namespace std;<br />
<br />
class HugeInt {<br />
<br />
public:<br />
short integer[30];<br />
HugeInt(); // default constructor<br />
HugeInt( long int ); // convert constructor<br />
HugeInt( const char * ); // convert constructor<br />
HugeInt operator+( HugeInt ); // addition operator<br />
void operator=( HugeInt ); // assignment operator<br />
void print( ofstream& ); // file output method<br />
};<br />
<br />
//main.cpp<br />
#include <fstream> // other directives and declarations as needed here<br />
#include "hugeint.h"<br />
<br />
using namespace std;<br />
<br />
int main()<br />
{<br />
HugeInt n1(7654321), n2(7891234),<br />
n3("99999999999999999999999999999"), n4("1"), n5;<br />
// define and open output file stream fout<br />
<br />
fstream fout;<br />
fout.open("file.txt");<br />
<br />
fout << "n1 is ";<br />
n1.print(fout);<br />
fout << endl;<br />
fout << "n2 is ";<br />
n2.print(fout);<br />
fout << endl;<br />
fout << "n3 is ";<br />
n3.print(fout);<br />
fout << endl;<br />
fout << "n4 is ";<br />
n4.print(fout);<br />
fout << endl;<br />
fout << "n5 is ";<br />
n5.print(fout);<br />
fout << endl;<br />
<br />
n5 = n1 + n2;<br />
n1.print(fout);<br />
fout << " + ";<br />
n2.print(fout);<br />
fout << " = ";<br />
n5.print(fout);<br />
fout << endl << endl;<br />
<br />
n5 = n3 + n4;<br />
n3.print(fout);<br />
fout << " + ";<br />
n4.print(fout);<br />
fout << " = ";<br />
n5.print(fout);<br />
fout << endl << endl;<br />
<br />
n5 = n1 + 9;<br />
n1.print(fout);<br />
fout << " + " << 9 << " = ";<br />
n5.print(fout);<br />
fout << endl; << endl;<br />
<br />
n5 = n2 + "10000";<br />
n2.print(fout);<br />
fout << " + " << "10000" << " = ";<br />
n5.print(fout);<br />
fout << endl << endl;<br />
<br />
// close output file stream fout<br />
fout.close();<br />
return 0;<br />
} <br />
<br />