parsing string using token and assigning to variables

Question

here is my loop

while(getline(iss,token,','))
     cout<<token<<endl;

the string in question is:

john doe,freshman,[email protected]

running the while leave outputs:

john doe
freshman
[email protected]

My goal is to assign each piece of the parsed string to a variable. example:

name = token;
cout<<"name: "<<name<<endl:

would produce

name: John doe

Then i would repeat for the other 2 pieces. Problem is I can't figure out to assign token to name, year, and email without it overwriting with each pass through the loop.

 90   string comma;
 91   string line;
 92   string token;
 93   ifstream myfile("student.dat");
 94   string name,email="";
 95   string status="";
 96   int id,i;
 97   if (myfile.is_open()){
 98     while ( getline (myfile,line) ) {
 99         //parse line
100         string myText(line);
101         cout<<line<<endl;
102         istringstream iss(myText);
103         if (!(iss>>id)) id=0;
104         i = 0;
105         while(getline(iss,token,','))
106         {
107             cout<<token<<endl;
108            
109            
110                 
111                
112            
113
114            
115         }
116         Student newStudent(id,line,"","");
117         Student::studentList.insert(std::pair<int,Student>(id,newStudent));

David G · Accepted Answer · 2014-02-22 21:35:21Z

0

You probably want something like this:

std::string name, year, email;

if (std::getline(iss, name, ',') &&
    std::getline(iss, year, ',') &&
    std::getline(iss, email))
{
     newStudent = Student(id, name, year, email);
}

Extract parts of the string into individual variables respectively, then send them over to the constructor.

answered Feb 22, 2014 at 21:35

David G

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3 Comments

user3341518 Over a year ago

That doesn't see to work because it first says newStudent there is no output when I go to print out the contents of the map.

user3341518 Over a year ago

The only thing being printed is the id number. It doesn't look like anything is being stored in name, year, email.

David G Over a year ago

It turns out all you need to do is ignore() before performing the first getline() call.

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