Question

Hi, I am trying to convert a string vector to a double vector in c++ , but for some reason I am getting this error message. Hope you can help! Thanks

error: cannot convert ‘std::string {aka std::basic_string<char>}’ to ‘const char*’ for argument ‘1’ to ‘double atof(const char*)’
double salary = atof(info[x].stringsalary);

my code is...

void display(vector<Employee_Data>& info){
double total = 0;
cout << "id" <<setw(25) <<"first name" <<setw(25) <<"last name" <<setw(25) <<"gender" <<setw(25) <<"department" <<setw(25) <<"salary" << endl ;
for(int x=0; x<info.size();x++){
cout<<info[x].id<<setw(25)<<info[x].first_name<<setw(25)<<info[x].last_name<<setw(25)<<info[x].department<<setw(25)<<info[x].gender<<setw(25)<< info[x].stringsalary<<endl;
double salary = atof(info[x].stringsalary);
total =+ salary;
}
cout << total;
  
}

Answer 1

void display(vector<Employee_Data>& info){
   double total = 0;
cout << "id" <<setw(25) <<"first name" <<setw(25) <<"last name" <<setw(25) <<"gender" <<setw(25) <<"department" <<setw(25) <<"salary" << endl ;
for(int x=0; x<info.size();x++){
cout<<info[x].id<<setw(25)<<info[x].first_name<<setw(25)<<info[x].last_name<<setw(25)<<info[x].department<<setw(25)<<info[x].gender<<setw(25)<< info[x].stringsalary<<endl;
//double salary = atof(info[x].stringsalary);//atof only works when given string to it,is a Ctype character array string
//so, first convert to Ctype character string, then pass it to atof
//#include <bits/stdc++.h>
//s.c_str() by this you can get character array
string s=info[x].stringsalary;
double salary = atof(s.c_str());
total =+ salary;
}
cout << total;
  
}