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Program of addition and subtraction of large numbers

Posted By: Easy Tutor     Category: C++ Programming     Views: 6398

This problem is about calculations with large numbers. Numbers can have at most 50 digits. The operations are limited to addition and substraction.

First line contains the number of test cases. Each test case consists of large numbers seperated by operators (plus or minus). Each test case will be terminated by =. All test cases will be seperated by an empty line.

The output contains the result of the evaluated expressions given in the input. Print each test case in a different line.

Code for Program of addition and subtraction of large numbers in C++ Programming

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

 int main( )
    {
       clrscr( );

       fstream File("CP-26.txt",ios::in|ios::nocreate);

       if(!File)
      {
         cout<<"\n Unable to open the input file."<<endl;
         cout<<"\n Press any key to exit.";

         getch( );
         exit(EXIT_FAILURE);
      }

       char Data[60]={NULL};
       char Temp[60]={NULL};
       char Operator[60]={NULL};
       char Result[60]={NULL};


       File.getline(Data,50);

       int test_cases=atoi(Data);

       for(int count=1;count<=test_cases;count++)
      {
         strset(Data,NULL);

         File.getline(Data,50);

         strrev(Data);

         do
        {
           strset(Temp,NULL);
           strset(Result,NULL);
           strset(Operator,NULL);

           File.getline(Operator,50);

           if(strcmp(Operator,"=")==0)
              break;

           File.getline(Temp,50);

           strrev(Temp);

           while(strlen(Temp)<strlen(Data))
              strcat(Temp,"0");

           while(strlen(Data)<strlen(Temp))
              strcat(Data,"0");

           int length=strlen(Data);

           if(strcmp(Operator,"+")==0)
              {
             int carry=0;
             int sum=0;
             int digit_1=0;
             int digit_2=0;

             char Sum[5]={NULL};

             for(int i=0;i<length;i++)
                {
                   digit_1=(int(Data[i])-48);
                   digit_2=(int(Temp[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");

             strset(Data,NULL);
             strcpy(Data,Result);
              }

           elseif(strcmp(Operator,"-")==0)
              {
             int borrow=0;
             int difference=0;
             int digit_1=0;
             int digit_2=0;

             char Difference[5]={NULL};

             for(int i=0;i<length;i++)
                {
                   digit_1=(int(Data[i])-48);
                   digit_2=(int(Temp[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);
                }

             strset(Data,NULL);
             strcpy(Data,Result);
              }
        }
         while(1);

         strrev(Data);

         cout<<Data<<endl;

         File.getline(Data,50);
      }

       File.close( );

       getch( );
       return 0;
    }
  
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Easy Tutor
Easy Tutor author of Program of addition and subtraction of large numbers is from United States. Easy Tutor says

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