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Count the top 10 films at the box office and save them in another file
2022-07-07 23:20:00 【Full stack programmer webmaster】
Hello everyone , I meet you again , I'm the king of the whole stack .
Today I saw a written test question , It's this : Given a file (m.dat). It saves the box office statistics of various films . The format is as follows :
《2012》 SONY 769.7 《 Harry Potter and the Deathly Hallows ( On )》 Warner Brothers 952.0 《 Star Wars: 》 Twentieth century fox 775.4 《 Shrek 4》 Paramount / DreamWorks 750.0 《 "Avatar" 》 Twentieth century fox 2,782.2 《 Harry Potter and the Goblet of Fire 》 Warner Brothers 895.9 《 Harry Potter and the Half-Blood Prince 》 Warner Brothers 934.0 《 The Lord of the rings 2: Twin towers 》 New line 925.3 《 Batman prequel 2: The dark knight 》 Warner Brothers 1,001.9 《 Harry Potter and the Sorcerer's Stone 》 Warner Brothers 974.7 《 Finding Nemo 》 Disney 867.9 《 Kung Fu Panda 》 Paramount / DreamWorks 631.7 《 Pirates of the Caribbean 3: The end of the world 》 Disney 961.0 《 Harry Potter and the prisoner of Azkaban 》 Warner Brothers 795.6 《E.T.》 World 792.9 《 Raiders of the lost ark 4: Crystal skeleton Kingdom 》 Paramount 786.6 《 The Lord of the rings 3: Return of the king 》 New line 1,119.1 《 Shrek 2》 DreamWorks 919.8 《 Toy Story Mania 3》 Disney 1,063.2 《 The matrix 2: regroup 》 Warner Brothers 742.1
.....
..
It is required to knock the code to count the top box office 10 In the movie . And save the statistical results into another file . Try to use it yourself C++ Achieve it , Code sharing, such as the following :(linux Next gcc compile )
gcc compile , Two command line parameters should be passed in at run time , example :./a.out m.dat li.dat (m.dat Is the source box office file .li.dat Before storage 10 The file of )
#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
class Movie {
public:
// Overload input operation
friend istream& operator>> (istream& is,
Movie& movie) {
return is >> movie.m_title >> movie.m_comp
>> movie.m_gross;
}
// Overload output operation
friend ostream& operator<< (ostream& os,
const Movie& movie) {
return os << movie.m_title << ' '
<< movie.m_comp << ' ' << movie.m_gross;
}
// Overload less than sign , be used for List Sort
bool operator< (const Movie& movie) const {
return gross () > movie.gross ();
}
private:
// Read from the file string Convert to double return
double gross (void) const {
string str (m_gross);
size_t pos = 0;
while ((pos = str.find_first_of ("$,", pos)) != // Remove the front of the box office "$" and ","
string::npos)
str.erase (pos, 1);
return atof (str.c_str ());
}
string m_title; // The movie name
string m_comp; // Company name
string m_gross; // box office
};
// Reading documents , The read results are stored in Vector<Movie>& vm
bool read (const char* file, vector<Movie>& vm) {
ifstream ifs (file);
if (! ifs) {
perror (" Failed to open box office file ");
return false;
}
Movie movie;
while (ifs >> movie) // Call overloaded >> The operator
vm.push_back (movie);
ifs.close ();
return true;
}
// Writing documents , hold vector<Movie>& vm Write data to file
bool write (const char* file, const vector<Movie>& vm){
ofstream ofs (file);
if (! ofs) {
perror (" Failed to open ranking file ");
return false;
}
for (vector<Movie>::const_iterator it = vm.begin();
it != vm.end (); ++it)
ofs << *it << endl; // Call overloaded << The operator
ofs.close ();
return true;
}
int main (int argc, char* argv[]) {
// Infer whether the number of command line parameters is legal
if (argc < 3) {
cerr << " Usage method :" << argv[0]
<< " < Box office documents > < Ranking file >" << endl;
return -1;
}
vector<Movie> vm;
if (! read (argv[1], vm))
return -1;
sort (vm.begin (), vm.end ()); // Yes vm Order of elements in
if (vm.size () > 10)
vm.resize (10); // Before sorting 10 individual
if (! write (argv[2], vm))
return -1;
return 0;
}
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