1// for循环画正16边形代码
2#include "CTurtle.hpp"
3#include <bits/stdc++.h>
4using namespace std;
5using namespace cturtle;
6
7int main() {
8    // 创建一个画布屏幕
9    TurtleScreen scr;
10    // 创建一个画图图标
11    Turtle turtle(scr);
12
13    int bianshu = 16;
14    int bianchang = 20;
15    double jiaodu = 360.0 / bianshu;
16
17    for (int i = 0; i < bianshu; ++i) {
18            turtle.forward(bianchang);
19            turtle.right(jiaodu);
20    }
21
22    // 暂停程序
23    system("pause");
24    // 程序结束
25    return 0;
26}

1#include <bits/stdc++.h>using namespace std;
2
3int main() {
4        int m, n;
5        cin >> m >> n;
6        int sum = 0;
7        for (int i = m; i <= n; ++i) {
8                if (i % 17 == 0) {
9                        sum += i;
10                }
11        }
12        cout << sum << endl;
13        return 0;
14}

1#include <bits/stdc++.h>using namespace std;
2
3int main() {
4        for (int ji = 1; ji <= 50; ++ji) {
5                int tu = 50 - ji;
6                if (ji * 2 + tu * 4 == 160) {
7                        cout << ji << " " << tu << endl;
8                        break;
9                }
10        }
11        return 0;
12}

1#include <bits/stdc++.h>using namespace std;
2
3int main() {
4        int n;
5        cin >> n;
6        int sum1 = 0;
7        int sum2 = 0;
8        for (int i = 1; i <= n; i++) {
9                if (i % 2 == 0) {
10                        sum1 += i;
11                } else {
12                        sum2 += i;
13                }
14        }
15        cout << sum1 << " " << sum2 <<endl;
16        return 0;
17}

for (①定义循环变量；②循环条件判断；③更新循变量) {
    ④循环操作
}

1int n = 100;
2int sum = 0;
3for (int i = 1; i <= n; ++i) {
4    sum += i;
5}
6cout << sum << endl;

int sum = 0;
for (int i = 100; i > 0; --i) {
    sum += i;
}
cout << sum << endl;

1int n = 100;
2int sum = 0;
3for (int i = 1; i <= n; i += 2) {
4    sum += i;
5}
6cout << sum << endl;

1int n = 100;
2int sum = 0;
3for (int i = 99; i >= 1; i -= 2) {
4    sum += i;
5}
6cout << sum << endl;