error: invalid conversion from 'char*' to 'char' on lines 26,36 - c++

Question

I am working on reading a file and formatting array so I can work on them with other stuff but I am stuck in the beginning. It says I can't change from char* to char but my token is not char*.
#include <iostream>
#include <fstream>
#include <sstream>
#include <cstring>
#include <string>
#include <stdio.h>
using namespace std;
void get_input(string teams[][2]) {
string infile;
double value;
char buffer[100];
char token;
stringstream ss;
cout << "Enter the input file: ";
cin >> infile;
ifstream file;
file.open (infile.c_str());
if (file.is_open()) {
int teamcounter = 0;
while (file.getline (buffer, 100)) {
int counter = 0;
token = strtok (buffer, ",");
while (token) {
if (counter == 0) {
teams[teamcounter][counter] = token;
}
else if ((counter == 1) || (counter == 2)) {
ss << token;
ss >> value;
teams[teamcounter][counter] = value;
}
token = strtok (NULL, ",");
counter++;
}
teamcounter++;
}
file.close();
}
else {
cout << "Unable to open file";
}
for (int i = 0; i< 7; i++){
for (int j = 0; j<2;j++){
cout << teams[i][j] << " ";
}
cout << endl;
}
}
Is making my array into string make me unable to put float or double values to them?
int main() {
cout << "Welcome to the football bracket game!" << endl;
string teams[7][2];
get_input(teams);
}
My input text format is like this:
Trojans, 0.80, 0.60
Bruins, 0.20, 0.30
Bears, 0.60, 0.50
Trees, 0.50, 0.40
Ducks, 0.40, 0.80
Beavers, 0.50. 0.10
Huskies, 0.80, 0.40
Cougars, 0.10, 0.90

Answer 1

char token;
token = strtok (buffer, ",");
token is of type char, strtok returns a char*. They are not of the same type and the compiler is complaining (logically) about it. strtok returns the pointer to the next token of the processed input char* so indeed there's no sense in assigning it to a single character.
Compiler is indeed unable to find a way to convert from the returnd char* to char, there's nothing strange in the error.

Answer 2

You defined variable token as having type char
char token;
while function strtok returns an obhect of type char * .So these statements
token = strtok (buffer, ",");
and
token = strtok (NULL, ",");
are invalid. I think you meant
char *token;
Also you defined array teams as an array of elements of type std::string
string teams[7][2];
However in function get_input you try to assign a value of type double to an object of type std::string
double value;
//...
teams[teamcounter][counter] = value;
Also it would be more correct if the function had second parameter that specifies the size of the first dimension of the array
void get_input(string teams[][2], int n );
and would be called as
get_input(teams, 7);
You should check how many lines of the file you entered.

Answer 3

strtok() returns a char* but your token variable is declared as char. It needs to be declared as char* instead.
Update: Since you are using C++, I strongly suggest you use C++, don't mix C and C++ together. Ignore strtok() even exists, eg:
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>
struct Team
{
std::string Name;
double Value1;
double Value2;
};
void get_input(std::vector<Team> &teams)
{
std::string infile;
std::ifstream file;
std::cout << "Enter the input file: ";
std::cin >> infile;
file.open (infile.c_str());
if (!file.is_open())
{
std::cout << "Unable to open file";
return;
}
std::string line;
while (std::getline(file, line))
{
Team team;
std::istringstream ss(line);
std::string token;
int counter = 0;
while (std::getline(ss, token, ","))
{
switch (counter)
{
case 0:
team.Name = token;
break;
case 1:
std::stringstream(token) >> team.Value1;
break;
case 2:
std::stringstream(token) >> team.Value2;
break;
}
++counter;
}
teams.push_back(team);
}
}
int main()
{
std::cout << "Welcome to the football bracket game!" << std::endl;
std::vector<Team> teams;
get_input(teams);
for (std::vector<Team>::iterator iter = teams.begin(); iter != teams.end(); ++iter)
{
std::cout << iter->Name << ": " << iter->Value1 << " " iter->Value2 << std::endl;
}
}