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Program to implement Add and Subtract functions on Big Number Class

Posted By: Easy Tutor     Category: C++ Programming     Views: 6166

A C++ Program to implement Add and Subtract functions on Big Number Class.

Code for Program to implement Add and Subtract functions on Big Number Class in C++ Programming

 # include <iostream.h>
 # include <string.h>
 # include <stdlib.h>
 # include <stdio.h>
 # include <conio.h>

 #define MAX_DIGITS 10
 #define MAX_LENGTH (MAX_DIGITS+5)

 /*************************************************************************///------------------------  Function Prototypes  ------------------------///*************************************************************************/class BigNumber
 {
    private:
       char cSign;
       char sValue[MAX_LENGTH];
       int iLength;

    public:
       BigNumber( );

       void read( );
       void show( );
       void plus(BigNumber);
       void minus(BigNumber);

       constchar* add(char[MAX_LENGTH],char[MAX_LENGTH]);
       constchar* subtract(char[MAX_LENGTH],char[MAX_LENGTH]);
 };

 BigNumber::BigNumber( )
 {
    cSign=' ';
    strset(sValue,NULL);
    iLength=0;
 }

 void BigNumber::read( )
 {
    char sTemp[MAX_LENGTH];

    strset(sTemp,NULL);
    strset(sValue,NULL);

    gets(sTemp);

    iLength=strlen(sTemp);

    if (sTemp[0]=='+' || sTemp[0]=='-')
    {
      cSign=sTemp[0];

      for(int i=1; i<iLength; i++)
     sValue[(i-1)]=sTemp[i];

      sValue[(i-1)]=NULL;
    }

    else
       strcpy(sValue,sTemp);

    iLength=strlen(sValue);

    for(int j=0; j<iLength; j++)
    {
       if (sValue[j] < '0' || sValue[j] > '9')
       {
      cSign=' ';
      strcpy(sValue,"0");
      iLength=1;

      break;
       }
    }
 }

 void BigNumber::show( )
 {
    if (cSign != ' ')
    cout<<cSign;

    cout<<sValue;
 }

 void BigNumber::plus(BigNumber Temp)
 {
    if ((cSign=='+' || cSign==' ') && (Temp.cSign=='+' || Temp.cSign==' '))
    {
       cSign=' ';
       strcpy(sValue,add(sValue,Temp.sValue));
    }

    elseif (cSign=='-' && Temp.cSign=='-')
       strcpy(sValue,add(sValue,Temp.sValue));

    else
    {
       if (iLength>Temp.iLength)
      strcpy(sValue,subtract(sValue,Temp.sValue));

       elseif (iLength<Temp.iLength)
       {
      cSign=Temp.cSign;
      strcpy(sValue,subtract(Temp.sValue,sValue));
       }

       else
       {
      int iFlag=0;

      for (int i=0; i<iLength; i++)
      {
         if (sValue[i]>Temp.sValue[i])
         {
        strcpy(sValue,subtract(sValue,Temp.sValue));
        iFlag=1;
        break;
         }

         elseif (sValue[i]<Temp.sValue[i])
         {
        cSign=Temp.cSign;
        strcpy(sValue,subtract(Temp.sValue,sValue));
        iFlag=1;
        break;
         }
      }

      if (iFlag==0)
      {
         cSign=' ';
         strcpy(sValue,"0");
      }
       }
    }

    iLength=strlen(sValue);
 }

 void BigNumber::minus(BigNumber Temp)
 {
    if ((cSign=='+' || cSign==' ') && (Temp.cSign=='+' || Temp.cSign==' '))
    {
       if (iLength>Temp.iLength)
      strcpy(sValue,subtract(sValue,Temp.sValue));

       elseif (iLength<Temp.iLength)
       {
      cSign='-';
      strcpy(sValue,subtract(Temp.sValue,sValue));
       }

       else
       {
      int iFlag=0;

      for (int i=0; i<iLength; i++)
      {
         if (sValue[i]>Temp.sValue[i])
         {
        strcpy(sValue,subtract(sValue,Temp.sValue));
        iFlag=1;
        break;
         }

         elseif (sValue[i]<Temp.sValue[i])
         {
        cSign='-';
        strcpy(sValue,subtract(Temp.sValue,sValue));
        iFlag=1;
        break;
         }
      }

      if (iFlag==0)
      {
         cSign=' ';
         strcpy(sValue,"0");
      }
       }
    }

    elseif ((cSign=='+' || cSign==' ') && Temp.cSign=='-')
    {
       if (iLength>Temp.iLength)
      strcpy(sValue,add(sValue,Temp.sValue));

       elseif (iLength<Temp.iLength)
       {
      cSign='-';
      strcpy(sValue,add(sValue,Temp.sValue));
       }

       else
       {
      int iFlag=0;

      for (int i=0; i<iLength; i++)
      {
         if (sValue[i]>Temp.sValue[i])
         {
        strcpy(sValue,add(sValue,Temp.sValue));
        iFlag=1;
        break;
         }

         elseif (sValue[i]<Temp.sValue[i])
         {
        cSign='-';
        strcpy(sValue,add(sValue,Temp.sValue));
        iFlag=1;
        break;
         }
      }

      if (iFlag==0)
      {
         cSign=' ';
         strcpy(sValue,add(sValue,Temp.sValue));
      }
       }
    }

    elseif (cSign=='-' && (Temp.cSign=='+' || Temp.cSign==' '))
    {
       if (iLength>Temp.iLength)
      strcpy(sValue,add(sValue,Temp.sValue));

       elseif (iLength<Temp.iLength)
       {
      cSign=Temp.cSign;
      strcpy(sValue,add(sValue,Temp.sValue));
       }

       else
       {
      int iFlag=0;

      for (int i=0; i<iLength; i++)
      {
         if (sValue[i]>Temp.sValue[i])
         {
        strcpy(sValue,add(sValue,Temp.sValue));
        iFlag=1;
        break;
         }

         elseif (sValue[i]<Temp.sValue[i])
         {
        cSign=Temp.cSign;
        strcpy(sValue,add(sValue,Temp.sValue));
        iFlag=1;
        break;
         }
      }

      if (iFlag==0)
      {
         cSign=' ';
         strcpy(sValue,add(sValue,Temp.sValue));
      }
       }
    }

    iLength=strlen(sValue);
 }

 constchar* BigNumber::add(char A[MAX_LENGTH],char B[MAX_LENGTH])
 {
    if (strlen(A) < strlen(B))
    {
       strrev(A);

       while(strlen(A)<strlen(B))
      strcat(A,"0");

       strrev(A);
    }

    if (strlen(B) < strlen(A))
    {
       strrev(B);

       while(strlen(B)<strlen(A))
      strcat(B,"0");

       strrev(B);
    }

    int length=strlen(A);

    int carry=0;
    int sum=0;
    int digit_1=0;
    int digit_2=0;

    char Sum[5]={NULL};
    char Result[MAX_LENGTH]={NULL};

    strset(Result,NULL);
    strrev(A);
    strrev(B);

    for(int i=0; i<length; i++)
    {
       digit_1=(int(B[i])-48);
       digit_2=(int(A[i])-48);

       sum=(digit_1+digit_2+carry);

       if(sum>9)
       {
      sum%=10;
      carry=1;
       }

       else
      carry=0;

       itoa(sum,Sum,10);
       strcat(Result,Sum);
    }

    if(carry)
       strcat(Result,"1");

    if (strlen(Result)>MAX_DIGITS)
       strcpy(Result,"0");

    strrev(Result);

    return Result;
 }

 constchar* BigNumber::subtract(char A[MAX_LENGTH],char B[MAX_LENGTH])
 {
    if (strlen(A) < strlen(B))
    {
       strrev(A);

       while(strlen(A)<strlen(B))
      strcat(A,"0");

       strrev(A);
    }

    if (strlen(B) < strlen(A))
    {
       strrev(B);

       while(strlen(B)<strlen(A))
      strcat(B,"0");

       strrev(B);
    }

    int length=strlen(A);

    int borrow=0;
    int difference=0;
    int digit_1=0;
    int digit_2=0;

    char Difference[5]={NULL};
    char Result[MAX_LENGTH]={NULL};

    strset(Result,NULL);
    strrev(A);
    strrev(B);

    for(int i=0;i<length;i++)
    {
       digit_1=(int(A[i])-48);
       digit_2=(int(B[i])-48);

       difference=(digit_1-digit_2-borrow);

       if(difference<0)
       {
      difference+=10;
      borrow=1;
       }

       else
      borrow=0;

       itoa(difference,Difference,10);
       strcat(Result,Difference);
    }

    while(Result[(strlen(Result)-1)]=='0')
       Result[(strlen(Result)-1)]=NULL;

    strrev(Result);

    return Result;
 }

 /*************************************************************************///------------------------------  main( )  ------------------------------///*************************************************************************/int main( )
 {
    clrscr( );

    BigNumber A, B;

    cout<<"Enter the value of A = ";
    A.read( );

    cout<<"Enter the value of B = ";
    B.read( );

    cout<<"Enter Operation (+ | -) : ";

    char cOperation=getch();

    cout<<endl<<endl<<"A = ";
    A.show( );

    cout<<endl<<"B = ";
    B.show( );

    cout<<endl;

    if (cOperation=='+')
    {
      A.plus(B);

      cout<<endl<<"Sum (A+B) = ";

      A.show( );
    }

    elseif (cOperation=='-')
    {
      A.minus(B);

      cout<<endl<<"Difference (A-B) = ";
      A.show( );
    }

    else
       cout<<endl<<"Invalid Operation!";

    getch( );
    return 0;
 }
  
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Easy Tutor author of Program to implement Add and Subtract functions on Big Number Class is from United States. Easy Tutor says

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