olkhovichs

string Name[n];

struct info {
    std::string Name;
    int H;
    char Sex;
};

std::vector<info> people;
info man = WriteStruct(info);
people.push_back(man);

for (int i = 0; i < people.size(); i++) {
   info man = people[i];
}

template <typename T>
T maxn(T arr[], int arrSize);

template <>
const char* maxn(const char* arr[], int arrSize);

template <> char* maxn(const char *arr[], int arrSize);

template <>
const char* maxn<const char*>(const char* arr[], int arrSize);

int input(TComplex& a, TComplex& b, TVect& first, TVect& second, float& one )
{

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 <cfloat>
...
if (res > -DBL_EPSILON && res < DBL_EPSILON) res = 0;
cout << res;

// MainWindow.h
class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget * parent = 0);
    ~MainWindow();

signals:

protected:

private:
    Ui::MainWindow * ui;
};

// MyTabWidget1.h
#pragma once

#include <QWidget>

namespace Ui {
class MyTabWidget1;
}

class MyTabWidget1: public QWidget
{
    Q_OBJECT

public:
    explicit MyTabWidget1(QWidget * parent = 0);
    ~MyTabWidget1();

private:
    Ui::MyTabWidget1* ui;
};

#include <iostream>
#include <string>
#include <fstream>
#include <time.h>

using namespace std;

int main() {
    srand((unsigned int)time(0));

    int n = 10; // количество строк в файле

    int random = rand() % n + 1;

    ifstream in("test.txt");
    string result;

    for (int i = 0; i < random; i++) {
        getline(in, result);
    }

    cout << result << endl;

    system("pause");
    return 0;
}