C++ ifstream, issue loading with ";" - c++

Question

int a, b;
while (infile >> a >> b)
{
// process pair (a,b)
}
So this is the code i've been watching but i ran into a problem because my strings doesn't have whitespaces between them, they have ";"
My code:
void load(string filename){ // [LOAD]
string line;
ifstream myfile(filename);
string thename;
string thenumber;
if (myfile.is_open())
{
while (myfile >> thename >> thenumber)
{
cout << thename << thenumber << endl;
//map_name.insert(make_pair(thename,thenumber));
}
myfile.close();
}
else cout << "Unable to open file";
}
[Inside the txt.file]
123;peter
789;oskar
456;jon
What i get right now is "thename" as 123;peter and "thenumber" as 789;oskar.
I want "thename" as peter and "thenumber" as 123 so i can then insert it back into my map correctly, How?

Answer 1

The infile >> a read from infile the eligible type for a. In your case a is int so '>>' expect to find an int. In your code myfile >> thename >> thenumber both are string type so they expect string type in your file. The problem is that string include ';' so the variable name will take all the row until it find \n(new line).
in your code
std::string thename, thenumber;
char delimeter(';'); //It is always '-' is it?
std::getline(std::cin, thename, delimeter);
std::getline(std::cin, thenumber);
also thenumber will be string type. To convert your thenumber into int:
std::istringstream ss(thenumber);
int i;
ss >> i;
if (ss.fail())
{
// Error
}
else
{
std::cout << "The integer value is: " << i;
}
return 0;

Answer 2

It is fairly simple to read in a file in the format. You can use std::getline with a different delimiter to tell it where to stop reading the input.
while(getline(myfile, thenumber, ';')) // reads until ';' or end of file
{
getline(myfile, thename); // reads until newline or end of file
map_name.insert(make_pair(thename,thenumber));
}

Answer 3

You have to input a single string and then split it to get the name and number
....
#include <string>
#include <sstream>
#include <vector>
std::vector<std::string> &split(const std::string &s, char delim, std::vector<std::string> &elems) {
std::stringstream ss(s);
std::string item;
while (std::getline(ss, item, delim)) {
elems.push_back(item);
}
return elems;
}
std::vector<std::string> split(const std::string &s, char delim) {
std::vector<std::string> elems;
split(s, delim, elems);
return elems;
}
....
void load(string filename){
..........
if (myfile.is_open())
{
while (myfile >>whole)
{
std::vector<std::string> parts = split(whole, ';');
name = parts[0];
number = parts[1];
}
}