A number expressed in scientific notation is represented by its mantissa (a frac

Question

A number expressed in scientific notation is represented by its mantissa (a fraction) and its exponent. Write a function that reads a character string that represents a number in C++ scientific notation and stores the number in a struct with two members. Write a function that prints the contents of this struct as a real value. Also write functions that compute the sum, product, difference, and quotient of two numbers in scientific notation stored in two struct arguments. (Hint: The string -0.1234E20 represents a number in scientific notation. The fraction -0.1234 is the mantissa and the number 20 is the exponent).

Explanation / Answer

ScientificNumber.h

#include<string>

struct ScientificNumber
{
   std::string mantissa;
   std::string exponent;
};

main.cpp

#include<iostream>
#include<string>
#include"ScientificNumber.h"
using namespace std;

ScientificNumber ReadStringandConverttoScientificNumber()
{
   string str;
   cin>>str;
   unsigned int locationOfE = str.find('E');
   string mantissa = str.substr(0, locationOfE);
   string exponent = str.substr(locationOfE + 1, str.size()-locationOfE);
   ScientificNumber sn;
   sn.mantissa = mantissa.c_str();
   sn.exponent = exponent.c_str();
   return sn;
}

string ScientificNumberinRealNumber(ScientificNumber number, bool print=true)
{
   string realnumber = "";
   int locationofdot = number.mantissa.find('.');
   int numberofcharactersafterdot = (number.mantissa.substr(locationofdot+1, number.mantissa.size() - locationofdot)).size();
   int numberofzeros = atoi(number.exponent.c_str()) - numberofcharactersafterdot;
   unsigned int wheretoplacedot = 0;
   for (size_t idx = 0; idx < number.mantissa.size(); idx++)
   {
       if (number.mantissa[idx] != '.')
       {
           realnumber.push_back(number.mantissa[idx]);
       }
   }
   if (numberofzeros >= 0)
   {
       for (size_t idx = 0; idx < numberofzeros; idx++)
       {
           realnumber.push_back('0');
       }
   }
   else
   {
       wheretoplacedot = realnumber.size() + numberofzeros;
       string stringafterdot = realnumber.substr(wheretoplacedot, realnumber.size() - wheretoplacedot);
       realnumber.erase(wheretoplacedot);
       realnumber.push_back('.');
       realnumber.append(stringafterdot);
   }
   if (print == true)
   {
       cout << realnumber <<endl;
   }
   return realnumber;
}

double sum(ScientificNumber a, ScientificNumber b)
{
   double number1 = atof(ScientificNumberinRealNumber(a,false).c_str());
   double number2 = atof(ScientificNumberinRealNumber(b,false).c_str());
   return number1 + number2;
  
}

double product(ScientificNumber a, ScientificNumber b)
{
   double number1 = atof(ScientificNumberinRealNumber(a,false).c_str());
   double number2 = atof(ScientificNumberinRealNumber(b, false).c_str());
   return number1 * number2;
}

double difference(ScientificNumber a, ScientificNumber b)
{
   double number1 = atof(ScientificNumberinRealNumber(a, false).c_str());
   double number2 = atof(ScientificNumberinRealNumber(b, false).c_str());
   return number1 - number2;
}

double quotient(ScientificNumber a, ScientificNumber b)
{
   double number1 = atof(ScientificNumberinRealNumber(a, false).c_str());
   double number2 = atof(ScientificNumberinRealNumber(b, false).c_str());
   return number1/number2;
}

int main()
{
   ScientificNumber a = ReadStringandConverttoScientificNumber();
   ScientificNumber b = ReadStringandConverttoScientificNumber();
   ScientificNumberinRealNumber(a);
   cout<<sum(a, b);
   cout << difference(a, b);
   cout << product(a, b);
   cout << quotient(a, b);

}

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