Question

Write a C++ code to prase the records list below--it's from a text file. Example of the output

First-line output: 1. Polylactic acid,8244, 541-25-3,C₂H₂Cl₃As, 207.32;

Second-line output: 2. LEWISITE, 6393,541-25-3, C₂H₂AsCl_{3,(C3-H6-O3)x,} 1250.032;

The User will be asked to input--including the semicolon- "NAME:" "ID:" "RO:" "Formula:" "Molar mass:" The Formula can you two data.

Record 1 & 2 are below-- as they appear in the text file.

Thanks!  

1. record

NAME: Polylactic acid

The monomer name is typically from fermented plant starch such as from corn, cassava, sugarcane or sugar beet pulp.

It was once manufactured in the U.S

ID: 8244

RO: 26100-51-6

Formula: C₂H₂AsCl_{3 [Lewis, R.J. Sr. (ed) Sax's Dangerous Properties of Industrial
Materials. 11th Edition. Wiley-Interscience, Wiley & Sons, Inc.
Hoboken, NJ. 2004., p. 768]}

Formula: C₂H₂Cl₃As

Molar mass: 207.32 g/mol

2. record

NAME: LEWISITE

Lewisite is a type of chemical warfare agent. This kind of agent is called a vesicant or blistering agent, because it causes blistering of the skin and mucous membranes on contact.

ID: 6393

RO: 541-25-3

Formula: C₂H₂AsCl₃

Formula: _(C3-H6-O3)x

Molar mass: 1250.032 g/mol

Answer 1

C++ code for the above problem is given along with explanation in comments:

------------------------------------------------------------------CODE-----------------------------------------------------------

#include<iostream>
#include<fstream>
#include<vector>
#include<sstream>
using namespace std;
vector<string> split(string s,char del);
int main()
{
   ifstream fin;
   string line,file;
   cout<<"Enter Input File:";
   cin>>file;
   //Open the Given file
   fin.open(file);
   vector<string> parsed;
   vector<vector<string>> res;
   //Read the file untill file ends
  
   while(fin)
   {
       getline(fin,line);
       if(line=="")
           continue;
       vector<string> v=split(line,' ');
       //First we split the line with : as delimiter
       //and check the first string if it is equal to NAME,ID,RO
       //then we append it to the vector
       if(v[0]=="NAME:" || v[0]=="ID:" || v[0]=="RO:"){
           parsed.push_back(v[1]);
       }
       //If the first word is Formula then we split it with ' '(space)
       //then we append second word to the vector parsed
       if(v[0]=="Formula:" && v.size()==2){
           parsed.push_back(v[1]);

       }
       if(v[0]=="Molar"){
           parsed.push_back(v[2]);
           res.push_back(parsed);
           parsed.clear();
       }

   }
   //Printing the output into the given
   //File and save it
   int k=1;
   cout<<"Enter Output File to Save:";
   cin>>file;
   ofstream out;
   out.open(file);
   for(vector<string> v:res){
           out<<k<<".";
       for(int i=0;i<v.size()-1;i++){
           out<<v[i]<<",";
       }
       out<<v[v.size()-1]<<";"<<endl;
       k++;
   }

}

//Splits the given string with the given delimiter
vector<string> split(string s,char del)
{
   vector <string> v;
   stringstream ss(s);
   string temp;
   while(getline(ss,temp,del))
   {
       v.push_back(temp);
   }
   return v;
}

-------------------------------------------------------------------END-------------------------------------------------------------

Code in sublime text:

sample.txt looks like:

Output: