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ex3.cc
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Fri, Nov 1, 07:51

ex3.cc
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#include <cstdlib>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <fstream>
#include <sstream>
#include <iomanip>
#include <iostream>
#include <array>
/* -------------------------------------------------------------------------- */
int main(int argc, char ** argv){
// read 3D point from file into array
const char* filename = "toto.txt";
std::ifstream fin(filename);
std::stringstream ss;
ss << fin.rdbuf();
std::array<double, 3> arr;
for (int i = 0; i < 3; ++i) {
ss >> arr[i];
}
std::cout << "Reading coordinates from " << filename << " into array: ";
for (const auto& e : arr){
std::cout << e << " ";
}
std::cout << std::endl;
// vector: 100 values from 0 to 2 PI
std::vector<double> vec;
int size = 100;
for (int i = 0; i < size; ++i){
vec.push_back(2.0 * M_PI / (size - 1) * i);
}
std::cout << "vec = " << vec.size() << " elements vector ranging from " <<
vec[0] << " to " << vec[size - 1] << std::endl;
// resize to 200 values -> indexes 100 to 199 are assigned to 0
vec.resize(2 * size);
std::cout << "vec resized to " << vec.size() << " elements. " <<
"New elements contain the value " << vec[size] << std::endl;
/* the "assign" method would assign new content to the vector, replacing its current content,
and modifying its size accordingly. */
vec.resize(size);
std::cout << "vec resized to " << vec.size() << " elements " << std::endl;
// Generate sinus vector
std::vector<std::pair<double, double>> sin_vect;
for (int i = 0; i < 100; ++i) {
sin_vect.push_back(std::make_pair(vec[i], sin(vec[i])));
}
std::cout << "sin_vect = " << sin_vect.size() << " pairs vector ranging from (" <<
sin_vect[0].first << ", " << sin_vect[0].second << ") to (" <<
sin_vect[size - 1].first << ", " << sin_vect[size -1].second << ")" << std::endl;
// Output sinus vector to text file
filename = "sinus.csv";
std::ofstream fout(filename);
for (int i = 0; i < size; ++i) {
fout << std::scientific << std::setprecision(20) <<
sin_vect[i].first << ',' << sin_vect[i].second << std::endl;
}
fout.close();
std::cout << "outputed sinus vector to " << filename << std::endl;
return EXIT_SUCCESS;
}

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