1// while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    int count = 0;
18    while (count < bianshu) {
19            turtle.forward(bianchang);
20            turtle.right(jiaodu);
21            ++count;
22    }
23
24    // 暂停程序
25    system("pause");
26    // 程序结束
27    return 0;
28}

1// do while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    int count = 0;
18    do {
19            turtle.forward(bianchang);
20            turtle.right(jiaodu);
21            ++count;
22    } while (count < bianshu);
23
24    // 暂停程序
25    system("pause");
26    // 程序结束
27    return 0;
28}

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

1#include <bits/stdc++.h>using namespace std;
2
3int main() {
4        int n;
5        cin >> n;
6        double sum = 0;
7        int i = 1;
8        while (i <= n) {
9                sum += 1.0 / i;
10                ++i;
11        }
12        printf("%.3f", sum);
13        return 0;
14}

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

1while (循环条件) {
2    // 若循环条件为真则运行大括号内代码
3    操作1
4    更新循环条件内变量值
5}
6// 若循环条件为假则跳出循环运行后续代码
7操作2

1int n = 100;
2int sum = 0;
3int i = 1;
4while (i <= n) {
5    sum += i;
6    ++i;
7}
8cout << sum << endl;

1do {
2    // 执行下列代码
3    操作1
4    更新循环条件内变量值
5} while (循环条件); //若循环条件为真则重复运行大括号内代码
6// 若循环条件为假则跳出循环运行后续代码
7操作2

1int n = 100;
2int sum = 0;
3int i = 1;
4do {
5    sum += i;
6    ++i;
7} while (i <= n);
8cout << sum << endl;