用c加加写一个程序求1!+2!+3!+…+n!的和
时间: 2024-01-09 11:21:15 浏览: 45
以下是用C++编写一个程序求1!+2!+3!+…+n!的和的例子:
```c++
#include <stdio.h>
int main() {
int n = 0;
int sum = 0;
int set = 1;
scanf("%d", &n);
for (int i = 1; i <= n; i++) {
set *= i;
sum += set;
}
printf("%d\n", sum);
return 0;
}
```
相关问题
用VS c加加写一个用easyx的贪吃蛇程序,包括用户注册登录页面
当然可以!下面是一个使用C++和EasyX图形库编写的贪吃蛇游戏程序,包括用户注册登录页面:
```cpp
#include <iostream>
#include <conio.h>
#include <graphics.h>
#include <fstream>
#include <string>
using namespace std;
const int WIDTH = 800; // 窗口宽度
const int HEIGHT = 600; // 窗口高度
const int CELL_SIZE = 20; // 单元格大小
struct User {
string username;
string password;
};
void registerUser() {
cleardevice();
settextstyle(20, 0, "宋体");
outtextxy(100, 100, "请输入用户名:");
char username[20];
cin >> username;
outtextxy(100, 150, "请输入密码:");
char password[20];
cin >> password;
ofstream file;
file.open("users.txt", ios::app);
file << username << " " << password << endl;
file.close();
outtextxy(100, 200, "注册成功!");
getch();
}
void loginUser() {
cleardevice();
settextstyle(20, 0, "宋体");
outtextxy(100, 100, "请输入用户名:");
char username[20];
cin >> username;
outtextxy(100, 150, "请输入密码:");
char password[20];
cin >> password;
ifstream file("users.txt");
string line;
bool userFound = false;
while (getline(file, line)) {
size_t pos = line.find(' ');
string storedUsername = line.substr(0, pos);
string storedPassword = line.substr(pos + 1);
if (storedUsername == username && storedPassword == password) {
userFound = true;
break;
}
}
file.close();
if (userFound) {
outtextxy(100, 200, "登录成功!");
getch();
cleardevice();
} else {
outtextxy(100, 200, "用户名或密码错误!");
getch();
cleardevice();
return;
}
}
void drawSnake(int x[], int y[], int length) {
setfillcolor(RGB(0, 255, 0)); // 绿色
for (int i = 0; i < length; i++) {
solidrectangle(x[i] * CELL_SIZE, y[i] * CELL_SIZE,
(x[i] + 1) * CELL_SIZE, (y[i] + 1) * CELL_SIZE);
}
}
void eraseSnakeTail(int x[], int y[], int length) {
setfillcolor(BLACK); // 黑色
solidrectangle(x[length - 1] * CELL_SIZE, y[length - 1] * CELL_SIZE,
(x[length - 1] + 1) * CELL_SIZE, (y[length - 1] + 1) * CELL_SIZE);
}
void generateFood(int &foodX, int &foodY, int x[], int y[], int length) {
bool overlap;
do {
overlap = false;
foodX = rand() % (WIDTH / CELL_SIZE);
foodY = rand() % (HEIGHT / CELL_SIZE);
for (int i = 0; i < length; i++) {
if (foodX == x[i] && foodY == y[i]) {
overlap = true;
break;
}
}
} while (overlap);
setfillcolor(RGB(255, 0, 0)); // 红色
solidrectangle(foodX * CELL_SIZE, foodY * CELL_SIZE,
(foodX + 1) * CELL_SIZE, (foodY + 1) * CELL_SIZE);
}
bool checkCollision(int x[], int y[], int length) {
int headX = x[0];
int headY = y[0];
if (headX < 0 || headX >= WIDTH / CELL_SIZE || headY < 0 || headY >= HEIGHT / CELL_SIZE) {
return true; // 越界
}
for (int i = 1; i < length; i++) {
if (headX == x[i] && headY == y[i]) {
return true; // 撞到自己的身体
}
}
return false;
}
void updateSnakePosition(int x[], int y[], int length, int dirX, int dirY) {
for (int i = length - 1; i > 0; i--) {
x[i] = x[i - 1];
y[i] = y[i - 1];
}
x[0] += dirX;
y[0] += dirY;
}
int main() {
initgraph(WIDTH, HEIGHT);
setbkcolor(BLACK);
cleardevice();
int choice;
cout << "1. 注册\n2. 登录\n";
cin >> choice;
if (choice == 1) {
registerUser();
} else if (choice == 2) {
loginUser();
}
int snakeX[100]; // 蛇身各部分的x坐标
int snakeY[100]; // 蛇身各部分的y坐标
int snakeLength = 1; // 蛇的长度
int foodX, foodY; // 食物的坐标
int dirX = 1, dirY = 0; // 蛇的移动方向
snakeX[0] = WIDTH / (2 * CELL_SIZE);
snakeY[0] = HEIGHT / (2 * CELL_SIZE);
generateFood(foodX, foodY, snakeX, snakeY, snakeLength);
while (true) {
if (_kbhit()) {
char key = _getch();
if (key == 'w' && dirY != 1) {
dirX = 0;
dirY = -1;
} else if (key == 's' && dirY != -1) {
dirX = 0;
dirY = 1;
} else if (key == 'a' && dirX != 1) {
dirX = -1;
dirY = 0;
} else if (key == 'd' && dirX != -1) {
dirX = 1;
dirY = 0;
}
}
eraseSnakeTail(snakeX, snakeY, snakeLength);
updateSnakePosition(snakeX, snakeY, snakeLength, dirX, dirY);
drawSnake(snakeX, snakeY, snakeLength);
if (checkCollision(snakeX, snakeY, snakeLength)) {
outtextxy(WIDTH / 2 - 100, HEIGHT / 2 - 20, "游戏结束!");
break;
}
if (snakeX[0] == foodX && snakeY[0] == foodY) {
snakeLength++;
generateFood(foodX, foodY, snakeX, snakeY, snakeLength);
}
Sleep(100);
}
getch();
closegraph();
return 0;
}
```
请确保你已经安装了EasyX图形库并正确配置了编译环境。这段代码实现了一个简单的贪吃蛇游戏程序,用户可以选择注册或登录。用户信息将保存在名为"users.txt"的文本文件中。
希望这对你有帮助!如果有任何问题,请随时问我。
用C加加写一个计算圆周率
我可以回答这个问题。以下是一个使用C++计算圆周率的示例代码:
#include <iostream>
using namespace std;
int main()
{
int n;
double pi = 0;
cout << "请输入n的值:";
cin >> n;
for (int i = 0; i < n; i++)
{
pi += 4.0 / (2 * i + 1) * ((i % 2 == 0) ? 1 : -1);
}
cout << "计算得到的圆周率为:" << pi << endl;
return 0;
}
这个程序使用了莱布尼茨级数公式来计算圆周率。用户需要输入一个整数n,程序将计算出前n项的和,得到圆周率的近似值。
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