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main.cc
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Tue, Feb 18, 22:58

main.cc
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#include <cstdlib>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <fstream>
#include <iomanip>
#include <sstream>
#include <iostream>
#include <map>
#include <set>
#include <array>
/* -------------------------------------------------------------------------- */
using Triplet = std::array<double, 3>;
/* -------------------------------------------------------------------------- */
inline std::ostream & operator <<(std::ostream & stream, Triplet & _this)
{
stream << _this[0] << " " << _this[1] << " " << _this[2];
return stream;
}
/* -------------------------------------------------------------------------- */
int main(int argc, char ** argv){
/*
Exercice 1
*/
if (argc != 2) {
std::cerr << "missing argument: your name" << std::endl;
return EXIT_FAILURE;
}
std::string myName = "Guillaume";
std::string argument = std::string(argv[1]);
if (myName == argument){
std::cout << "You have a nive name" << std::endl;
}
/*
Exercice 2
*/
std::ofstream f("toto.txt");
f << 1.5 << " " << 1.0 << " " << 2.0 << std::endl;
std::ifstream is("toto.txt");
std::string str;
if (is.is_open() == false) {
std::cerr << "cannot open file toto.txt" << std::endl;
throw;
}
getline(is, str);
std::stringstream sstr(str);
double x, y, z;
sstr >> x;
sstr >> y;
sstr >> z;
std::cout << x << " " << y << " " << z << std::endl;
/*
Exercice 3
*/
std::array<double, 3> point = { x, y, z};
for (auto & p: point) {
std::cout << p << " ";
}
std::cout << "\n";
std::vector<double> vect;
int npoints = 100;
for (int i = 0; i < npoints; ++i) {
double step = 2.*M_PI / npoints;
vect.push_back(step*i);
}
std::cout << vect.size() << std::endl;
std::vector< std::pair<double, double> > sin_vect;
for (auto & pi: vect) {
sin_vect.push_back(std::make_pair(pi, sin(pi)) );
}
std::ofstream of("sin_pi.txt");
for (auto & pairs: sin_vect){
of << std::scientific << std::setprecision(20)
<< pairs.first << " " << pairs.second << std::endl;
}
/*
Exercice 5
*/
std::map<std::string,Triplet> map;
Triplet origin_coordinates = {0., 0., 0.};
//Triplet origin_coordinates(0.,0.,0.);
map["sun"] = origin_coordinates;
std::map<std::string,Triplet>::iterator end3 = map.end();
//origin_coordinates.coords[0] = 1.;
origin_coordinates[0] = 1.;
std::map<std::string,Triplet>::iterator it3 = map.find("earth");
if (it3 == end3) map["earth"] = origin_coordinates;
std::set<std::string> keys;
std::cout << std::endl << "The complete map content is:" << std::endl;
for (auto & planet: map ){
auto & key = planet.first;
auto & values = planet.second;
std::cout << key << std::endl;
std::cout << values << std::endl;
keys.insert(key);
}
std::map<std::string,Triplet> map2;
Triplet mercury_coordinates = {0.25, 0., 0.};
map2["mercury"] = mercury_coordinates;
Triplet earth_coordinates = {1.25, 0., 0.};
map2["earth"] = earth_coordinates;
Triplet jupiter_coordinates = {5.25, 0., 0.};
map2["jupiter"] = jupiter_coordinates;
Triplet sun_coordinates = {0., 0., 0.};
map2["sun"] = sun_coordinates;
std::set<std::string> keys2;
std::cout << std::endl << "The complete map 2 content is:" << std::endl;
for (auto & planet: map2) {
auto & key = planet.first;
auto & values = planet.second;
std::cout << key << std::endl;
std::cout << values << std::endl;
keys2.insert(key);
}
std::set<std::string> intersect;
std::set_intersection( keys.begin(), keys.end(), keys2.begin(), keys2.end(),
std::inserter( intersect, intersect.begin() ) );
std::map<std::string, Triplet> map_intersect;
for(auto & key: intersect) {
map_intersect[key] = map2[key];
}
std::cout << std::endl << "The complete intersected map content is:" << std::endl;
for(auto & planet: map_intersect) {
std::cout << planet.first << std::endl;
std::cout << planet.second << std::endl;
}
return EXIT_SUCCESS;
}

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