第五章
1
cpp
复制代码
#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
cpp
复制代码
#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
cpp
复制代码
#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
cpp
复制代码
#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
cpp
复制代码
#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
cpp
复制代码
#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;
}