Why my program is printing incorrect values, not the supplied values? Any help would be much appreciated.
Data
title1=q, year1=1, title2=w, year2=2
Code
#include <iostream>
#include <string>
#include <sstream>
#include <vector>
using namespace std;
int getnumber ();
struct movies_t {
string title;
int year;
};
void printmovie (movies_t films);
int main ()
{
int z=getnumber ();
cout << "You will have to provide data for " << z << " films.\n";
//movies_t films [z];
vector<movies_t> films(z);
string mystr;
int n;
for (n=0; n<z; n )
{
cout << "Enter title: ";
getline (cin,films[n].title);
cin.ignore();
cout << "Enter year: ";
getline (cin,mystr);
cin.ignore();
stringstream(mystr) >> films[n].year;
}
cout << "\nYou have entered these movies:\n";
for (n=0; n<z; n )
printmovie (films[n]);
return 0;
}
void printmovie (movies_t films)
{
movies_t * pmovie;
pmovie = &films;
cout << pmovie->title;
cout << " (" << films.year << ")\n";
}
int getnumber ()
{
int i;
cout << "Please enter number of films: ";
cin >> i;
return i;
}
Output (obtained; incorrect)
Please enter number of films: 2
You will have to provide data for 2 films.
Enter title: q
Enter year: 1
Enter title: w
Enter year: 2
You have entered these movies:
(0)
(0)
Output (desired)
Please enter number of films: 2
You will have to provide data for 2 films.
Enter title: q
Enter year: 1
Enter title: w
Enter year: 2
You have entered these movies:
q (1)
w (2)
CodePudding user response:
Make a function that gets the value after =
in each token.
string getValue(string field) {
auto pos = field.find('=');
return field.substr(pos 1, field.find(',') - pos - 1);
}
Then all you need to do is:
for (n = 0; n < z; n ) {
string title, year;
assert(cin >> title >> year);
movies_t movie = {getValue(title), stoi(getValue(year))};
films.push_back(movie);
}
To use assert
you need #include <cassert>
at the top.
Update:
You need to ignore spaces, so add this to your program:
struct ctype_ : std::ctype<char>
{
static mask* make_table()
{
const mask* table = classic_table();
static std::vector<mask> v(table, table table_size);
v[' '] &= ~space;
v[','] |= space;
return &v[0];
}
ctype_() : std::ctype<char>(make_table()) { }
};
And then do this just before the for
loop:
cin.imbue(std::locale(cin.getloc(), new ctype_));
2nd update:
for (n = 0; n < z; n ) {
string title, year;
cout << "Enter title: ";
assert(cin >> title);
cout << "Enter year: ";
assert(cin >> year);
movies_t movie = {getValue(title), stoi(getValue(year))};
films[n] = movie;
}