第五章

1

#include <iostream>
#include <array>using namespace std;void main() {int n1, n2;cin >> n1 >> n2;int sum = 0;for (int i = n1; i <= n2; i++) {sum += i;}cout << sum;
}

2

#include <iostream>
#include <array>using namespace std;const int ArSize = 16;void main() {array<long double,ArSize> factorials;factorials[1] = factorials[0] = 1;for (int i = 2; i < ArSize; i++)factorials[i] = i * factorials[i - 1];for (int i = 0; i < ArSize; i++)std::cout << i << "!=" << factorials[i] << std::endl;}

3

#include <iostream>
#include <array>using namespace std;void main() {int sum = 0;int n = 1;while (n != 0) {cin >> n;sum += n;cout << sum << endl;}}

4

#include <iostream>
#include <array>using namespace std;double Daphne_money(int years) {return 100+0.1 * 100 * years;
}double Cleo_money( int years) {if (years == 1)return 100;else {return Cleo_money(years - 1) * 1.05;}
}void main() {int years = 1;while (Daphne_money(years) > Cleo_money(years)) {years++;}cout << years;
}

5

#include <iostream>
#include <vector>
#include <string>using namespace std;void main() {vector<string> sells = { "January", "February", "March", "April", "May", "June","July", "August", "September", "October", "November","December" };vector<int> number(12);int total = 0;for (int i = 0; i < 12; i++) {cout << "Total sells in " << sells[i] << " is:" << endl;cin >> number[i];total += number[i];}cout << "total sells is" << total << endl;
}

6

#include <iostream>
#include <vector>
#include <string>using namespace std;void main() {vector<vector<string>> sells(3,vector<string>(12));sells= { { "January", "February", "March", "April", "May", "June","July", "August", "September", "October", "November","December" },{ "January", "February", "March", "April", "May", "June","July", "August", "September", "October", "November","December" },{ "January", "February", "March", "April", "May", "June","July", "August", "September", "October", "November","December" } };vector<vector<int>> number(3,vector<int>(12));int total_per_year[3] = { 0,0,0 };int total = 0;for (int j = 0; j < 3; j++) {for (int i = 0; i < 12; i++) {cout << "Total sells in " << sells[j][i] <<" No."<<j+1<< "year is:" << endl;cin >> number[j][i];total_per_year[j] += number[j][i];total += number[j][i];}cout << "total sells in No." << j+1 << " year is" << total_per_year[j] << endl;}cout << "total sells of all years is" << total << endl;
}