Вообще, хотелось бы узнать как можно нециклически вывести файлы в папке через filesystem, в интернете и на форумах не получилось найти :(
//lines.erase(unique(lines.begin(), lines.end()), lines.end());auto in = ifstream("in.txt");
auto out = ofstream("out.txt");
list<string> ls;
copy(istream_iterator<string>(in), {}, back_inserter(ls));
ls.sort();
ls.unique();
copy(ls.begin(), ls.end(), ostream_iterator<string>(out, "\n"));#include <iostream>
using namespace std;
struct MyData {
int value;
MyData(int v) : value(v){}
MyData() : value(0){}
};
istream& operator>>(istream& is, MyData& data)
{
is >> data.value;
return is;
}
ostream& operator<<(ostream& os, MyData& data)
{
os << data.value;
return os;
}
bool operator==(const MyData& lh, const MyData& rh)
{
return lh.value == rh.value;
}
bool operator!=(const MyData& lh, const MyData& rh)
{
return !(lh.value == rh.value);
}
MyData try_read_while_not(MyData d, const string& message)
{
MyData val;
while(val != d)
{
cout << message;
cin >> val;
}
return val;
}
int main()
{
MyData correct(42);
MyData val = try_read_while_not(correct, "Введите значение: ");
cout << val;
}#include <iostream>
#include <map>
using namespace std;
int main()
{
map<char, int> table;
char c = 0;
while(cin >> c) table[c]++;
for(auto [ch, cnt] : table)
{
cout << "symbol: '" << ch << "' count: " << cnt << "\n";
}
}#include <iostream>
#include <string>
#include <map>
using namespace std;
int main()
{
map<char, int> table;
string s;
getline(cin, s);
for(char c : s) table[c]++;
for(auto [ch, cnt] : table)
{
cout << "symbol: '" << ch << "' count: " << cnt << "\n";
}
}как вместо цикла while можно использовать рекурсию
int getLength(long long value) {
return (value == 0) ? 0 : getLength(value / 10) + 1;
}#include <iostream>
#include <algorithm>
#include <string>
#include <numeric>
#include <vector>
#include <iterator>
using namespace std;
//Придумай сам алгоритм число в строку или нагугли
string lineNumberToString(int ln)
{
return to_string(ln) + " сторка ";
}
int main()
{
auto nums2dArray = vector<vector<int>>{{32,23}, {25,12}};
transform(begin(nums2dArray),
end(nums2dArray),
ostream_iterator<string>(cout, "\n"),
[](auto row){
static int lineNumber = 1;
return lineNumberToString(lineNumber++) +
to_string(accumulate(begin(row), end(row), 0));
});
}
int k = 30, m = 560, n = 99;
int* a[] = { &k, &m, &n };
for (int i = 0; i < std::size(a) - 1; ++i)
{
for (int j = 0; j < std::size(a) - i - 1; ++j)
{
if (*a[j] < *a[j + 1])
{
std::swap(*a[i], *a[i + 1]);
}
}
}
std::cout << k << " < " << m << " < " << n;Нужно сгенерировать 15 чисел от 100 до 1000(включая дробные) и вывести 15 чисел в которых есть цыфра 7.
#include <iostream>
#include <vector>
#include <string>
#include <random>
#include <algorithm>
#include <iterator>
#include <iomanip>
#include <limits>
using namespace std;
// Не важно, пусть будет так.
auto getNRandomNumbersVecFromRange(const double low, const double hi, const int n){
random_device rd;
mt19937 gen(rd());
uniform_real_distribution<> dis(low, hi);
vector<double> randNumbersVec(n);
generate_n(randNumbersVec.begin(), n, [&dis, &gen]{ return dis(gen); });
return randNumbersVec;
}
int main()
{
auto numbers = getNRandomNumbersVecFromRange(100.0, 1000.0, 15);
cout << setprecision(numeric_limits<double>::digits10 + 1);
copy(numbers.cbegin(), numbers.cend(), ostream_iterator<double>(cout, "\n"));
cout << "\n" << "result:" << "\n"; // "\nresult\n"
// А это важно --> to_string(n).find('7') != string::npos
copy_if(numbers.cbegin(), numbers.cend(),
ostream_iterator<double>(cout, "\n"),
[](auto n) { return to_string(n).find('7') != string::npos; });
}#include<iostream>
#include<string>
#include<fstream>
#include<algorithm>
#include<vector>
#include<iterator>
#include<numeric>
using namespace std;
struct Record {
string surname;
string dbname;
int salary;
};
istream& operator>>(istream& is, Record& r)
{
is >> r.surname;
is.ignore(6, '|');
is >> r.dbname;
is.ignore(6, '|');
is.ignore(6, '*');
is >> r.salary;
return is;
}
ostream& operator<<(ostream& os, const Record& r)
{
os << r.surname << " "
<< r.dbname << " "
<< r.salary;
return os;
}
int main()
{
vector<Record> database;
if(ifstream file("databasename.db"); file)
{
copy(istream_iterator<Record>(file), {}, back_inserter(database));
}
string db;
cin >> db;
int acc = accumulate(database.begin(), database.end(), 0, [&](int init, Record const& rec){
return (db == rec.dbname) ? init + rec.salary : init;
});
cout << db << ": " << acc;
//copy(database.begin(), database.end(), ostream_iterator<Record>(cout, "\n"));
}std::string s = "123456789101112";
int i = s[2] - '0';#include <iostream>
#include <algorithm>
#include <string>
using namespace std;
int main()
{
string s = "G:/Dev/MinGW/bin/Patch.exe -p0 -i"
" G:/avidemux_2.7.4/avidemux_core/..//avidemux_core/"
"ffmpeg_package//patches////////libavcodec_ac3_h.patch ";
auto end = unique(s.begin(), s.end(), [](unsigned char l, unsigned char r){
return l == '/' && r == '/';
});
s.erase(end, s.end());
cout << s;
}инициализация идет у функциях выше
int number_of_goods; // Вот тут рандомное значение
int* price_of_goods = new int[number_of_goods]; // ???int count_of_days; // Вот тут тоже
int *works_hours = new int[count_of_days]; // ???for (int i = 0; i < sizeof(price_of_goods)/sizeof(int); i++) {
if (temp == price_of_goods[i]) {
cout << "Yes, it has this price" << endl;
z++;
break;
}sizeof(price_of_goods) == sizeof(int*) / sizeof(int)#include <iostream>
#include <algorithm>
#include <sstream>
#include <string>
#include <vector>
#include <iterator>
using namespace std;
int main()
{
string s = "xxxxxxxxxxxxxxxxxx|yyyyyyyyyyyyyyyyyy|zzzzzzzzzzzzzzzzzz";
auto ss = istringstream(s);
vector<string> vs;
string line;
while(getline(ss, line, '|'))
{
vs.push_back(line);
// В твоем случае
// WriteFile(file, line.c_str(), line.size(), &written, 0);
}
copy(vs.begin(), vs.end(), ostream_iterator<string>(cout, " "));
}basic_istream& getline( char_type* s, std::streamsize count );#include <iostream>
#include <algorithm>
#include <iterator>
#include <cctype>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
auto get_numbers = [](istream& is){
vector<int> numbers;
if(is){
int n = 0;
while(is.get() != 10) // 10 linux; 13 windows
{
is.unget();
is >> n;
numbers.push_back(n);
}
}
return numbers;
};
auto get_numbers2 = [](istream& is){
string s;
getline(is, s);
istringstream sn(s);
vector<int> numbers;
copy(istream_iterator<int>(sn), {}, back_inserter(numbers));
return numbers;
};
auto get_numbers3 = [](istream& is){
char c = 0;
vector<int> numbers;
int n = 0;
// вот тут предполагается что на вход будут подаваться
// все таки обычные целые числа а не 5---42 --28-------56
while((c = is.get()) && (isdigit(c) || c == ' ' || c == '-'))
{
is.unget();
is >> n;
numbers.push_back(n);
}
return numbers;
};
int main()
{
auto vn = get_numbers(cin);
if(!vn.empty())
{
copy(vn.begin(), vn.end(), ostream_iterator<int>(cout, " "));
}
else
{
cout << "empty vn";
}
cout << endl;
auto vn2 = get_numbers2(cin);
if(!vn2.empty())
{
copy(vn2.begin(), vn2.end(), ostream_iterator<int>(cout, " "));
}
else
{
cout << "empty vn2" << endl;
}
cout << endl;
auto vn3 = get_numbers3(cin);
if(!vn3.empty())
{
copy(vn3.begin(), vn3.end(), ostream_iterator<int>(cout, " "));
}
else
{
cout << "empty vn3" << endl;
}
}