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Top Forums Programming C++ getline, parse and take first tokens by condition Post 302917775 by yifangt on Thursday 18th of September 2014 01:01:21 PM
Old 09-18-2014
Thought of combining the map<string, string> container with the program.
Store all the combined sequence entries in map< string, string>; which will be:
1) easier to print and avoid the problem like extra blank line for the first entry;
2) convenient to retrieve part of the sequences by sequence ID (i.e. the key of the map).
Here is my modified code that was compiled well with Segmentation fault when run.
Code:
#include <iostream> 
#include <fstream> 
#include <string>
#include <map>

using namespace std;  
int main() 
{     
ifstream inFILE("infile.fasta");     
int inGuard = 1;               //using a guard variable
    
    map <string, string>FastaSeq;   //Declare a map to hold each sequence entry

    while (inFILE.good()) {     
    string line;        //declare string for each line      
    string entryID, sequence;    //declare two strings for key and value for map
    getline(inFILE, line);    //Read the whole line      
    char *sPtr;        //Declare char pointer sPtr for tokens     

     //Initialize char pointer sArray for conversion of the string to char*     
     char *sArray = new char[line.length() + 1];     
     strcpy(sArray, line.c_str());

     if (sArray[0] == '>') {         
     sPtr = strtok(sArray, " ");    //Using space as delimiter get the first token.         
     cout << sPtr << " ";       //Print the first token only         
     entryID = sPtr;             //assign the first token as key for the map
     continue;     
}     
 else  {         
     sPtr = strtok(sArray, " ");    //Get all the tokens with " " as delimiter.         
     FastaSeq[entryID] += sPtr;   // assign first part of sequence to map
           
while (sPtr != NULL) {          //For all tokens     
     cout << sPtr;
     FastaSeq[entryID] += sPtr;   // assign more token to sequence
     sPtr = strtok(NULL, " ");         
     }     
   }     
}      
cout << endl;    
 inFILE.close(); 

//print the map    
map <string, string>::const_iterator seq_itr;
if (seq_itr != FastaSeq.end()){
      cout << seq_itr->first << " ";
      cout << seq_itr->second << endl;
}

    return 0; 
}

The parts I was not sure are the "appending" of the parsed third and after tokens to the second token as sequence (value of map) highlighted in red FastaSeq[entryID] += sPtr;, which may be the problem for the program. Thanks a lot!

Last edited by yifangt; 09-19-2014 at 04:23 PM..
 

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