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GESP C++编程一级标准编程实例

作者：

tmxkok516

在

1. 变量与数据类型实例

整数变量的使用

#include <iostream>
using namespace std;

int main() {
    int a = 10;
    cout << "a=" << a << endl;
    return 0;
}

浮点变量的使用

#include <iostream>
using namespace std;
int main() {
    float a = 3.14;
    cout << "a=" << a << endl;
    return 0;
}

字符变量的使用

#include <iostream>
using namespace std;
int main() {
    char ch = 'A';
    cout << "字符变量的值: " << ch << endl;
    return 0;
}

2. 运算符与表达式实例

算术运算符实例

#include <iostream>
using namespace std;
int main() {
    int a = 10, b = 3;
    cout << "加法: " << a + b << endl;
    cout << "减法: " << a - b << endl;
    cout << "乘法: " << a * b << endl;
    cout << "除法: " << a / b << endl;
    cout << "取余: " << a % b << endl;
    return 0;
}

关系运算符实例

#include <iostream>
using namespace std;
int main() {
    int a = 10, b = 3;
    cout << "a > b: " << (a > b) << endl;
    cout << "a < b: " << (a < b) << endl;
    cout << "a >= b: " << (a >= b) << endl;
    cout << "a <= b: " << (a <= b) << endl;
    cout << "a == b: " << (a == b) << endl;
    cout << "a != b: " << (a != b) << endl;
    return 0;
}

逻辑运算符实例

#include <iostream>
using namespace std;
int main() {
    bool p = true, q = false;
    cout << "p && q: " << (p && q) << endl;
    cout << "p || q: " << (p || q) << endl;
    cout << "!p: " << (!p) << endl;
    return 0;
}

3. 输入输出语句实例

标准输入语句示例

#include <iostream>
using namespace std;
int main() {
    int num;
    cout << "请输入一个整数: ";
    cin >> num;
    cout << "你输入的整数是: " << num << endl;
    return 0;
}

标准输出语句示例

#include <iostream>
using namespace std;
int main() {
    cout << "这是一个标准输出语句示例。" << endl;
    return 0;
}

4. 顺序结构程序实例

简单数学计算程序

#include <iostream>
using namespace std;
int main() {
    int a = 5, b = 3;
    int result = a * a + b * b;
    cout << "a^2 + b^2 的结果是: " << result << endl;
    return 0;
}

数据处理程序

#include <iostream>
using namespace std;
int main() {
    int num1, num2;
    cout << "请输入两个整数: ";
    cin >> num1 >> num2;
    int sum = num1 + num2;
    int average = sum / 2;
    cout << "两数之和: " << sum << endl;
    cout << "两数平均值: " << average << endl;
    return 0;
}

5. 选择结构程序实例

if语句应用实例

#include <iostream>
using namespace std;
int main() {
    int num;
    cout << "请输入一个整数: ";
    cin >> num;
    if (num > 0) {
        cout << "你输入的是正数。" << endl;
    }
    return 0;
}

if – else语句应用实例

#include <iostream>
using namespace std;
int main() {
    int num;
    cout << "请输入一个整数: ";
    cin >> num;
    if (num > 0) {
        cout << "你输入的是正数。" << endl;
    } else {
        cout << "你输入的是负数或零。" << endl;
    }
    return 0;
}

6. 循环结构程序实例

for循环实例

#include <iostream>
using namespace std;
int main() {
    for (int i = 1; i <= 5; i++) {
        cout << i << endl;
    }
    return 0;
}

while循环实例

#include <iostream>
using namespace std;
int main() {
    int i = 1;
    while (i <= 5) {
        cout << i << endl;
        i++;
    }
    return 0;
}

do – while循环实例

#include <iostream>
using namespace std;
int main() {
    int i = 1;
    do {
        cout << i << endl;
        i++;
    } while (i <= 5);
    return 0;
}

7. 函数的使用实例

自定义函数示例

#include <iostream>
using namespace std;
int add(int a, int b) {
    return a + b;
}
int main() {
    int result = add(3, 5);
    cout << "两数之和: " << result << endl;
    return 0;
}

函数调用实例

#include <iostream>
using namespace std;
int square(int num) {
    return num * num;
}
int main() {
    int num = 4;
    int result = square(num);
    cout << num << " 的平方是: " << result << endl;
    return 0;
}

8. 综合应用实例

计算圆的面积

#include <iostream>
using namespace std;
const double PI = 3.14159;
int main() {
    double radius;
    cout << "请输入圆的半径：";
    cin >> radius;
    double area = PI * radius * radius;
    cout << "圆的面积是：" << area << endl;
    return 0;
}

求三个数中的最大值

#include <iostream>
using namespace std;
int main() {
    int a, b, c;
    cout << "请输入三个整数：";
    cin >> a >> b >> c;
    int max_num = a;
    if (b > max_num) {
        max_num = b;
    }
    if (c > max_num) {
        max_num = c;
    }
    cout << "三个数中的最大值是：" << max_num << endl;
    return 0;
}

输出三个数中的最大值

#include <iostream>  
using namespace std;  
int main() {  
    int a, b, c;  
    cin >> a >> b >> c;  
    cout << max(a, max(b, c));  
    return 0;  
}

输出Hello World

#include <iostream>
using namespace std;
int main() {
    cout << "Hello World!";
    return 0;
}

两数相加

#include <iostream>
using namespace std;
int main() {
    int a, b;
    cin >> a >> b;
    cout << a + b;
    return 0;
}

判断奇偶数

#include <iostream>
using namespace std;
int main() {
    int num;
    cin >> num;
    if(num % 2 == 0) cout << "Even";
    else cout << "Odd";
    return 0;
}

打印1-10

#include <iostream>
using namespace std;
int main() {
    for(int i=1; i<=10; i++){
        cout << i << " ";
    }
    return 0;
}

计算平均数

#include <iostream>
using namespace std;
int main() {
    float a,b,c;
    cin >> a >> b >> c;
    cout << (a+b+c)/3;
    return 0;
}

判断闰年

#include <iostream>
using namespace std;
int main() {
    int year;
    cin >> year;
    if((year%4==0 && year%100!=0) || year%400==0)
        cout << "Yes";
    else
        cout << "No";
    return 0;
}

计算阶乘

#include <iostream>
using namespace std;
int main() {
    int n,sum=1;
    cin >> n;
    for(int i=1;i<=n;i++) sum *= i;
    cout << sum;
    return 0;
}

数字逆序

#include <iostream>
using namespace std;
int main() {
    int num;
    cin >> num;
    while(num>0){
        cout << num%10;
        num /=10;
    }
    return 0;
}

判断质数

#include <iostream>
using namespace std;
int main() {
    int n;
    cin >> n;
    for(int i=2;i*i<=n;i++){
        if(n%i==0){
            cout << "No";
            return 0;
        }
    }
    cout << "Yes";
    return 0;
}

斐波那契数列

#include <iostream>
using namespace std;
int main() {
    int n,a=0,b=1;
    cin >> n;
    for(int i=0;i<n;i++){
        cout << a << " ";
        int temp = a;
        a = b;
        b = temp + b;
    }
    return 0;
}

求绝对值

输入一个整数，输出其绝对值。

输入样例：-8

输出样例：8

#include <iostream>
#include <cmath>
using namespace std;
int main() {
    int num;
    cin >> num;
    int absNum = abs(num);
    cout << absNum << endl;
    return 0;
}

计算三角形周长

输入三个整数表示边长（保证能构成三角形），输出周长。

输入样例：3 4 5

输出样例：12

#include <iostream>
using namespace std;
int main() {
    int a, b, c;
    cin >> a >> b >> c;
    int perimeter = a + b + c;
    cout << perimeter << endl;
    return 0;
}

统计字符数量

输入一个字符和一个字符串，统计字符在字符串中出现的次数。

输入样例：a banana

输出样例：3

#include <iostream>
#include <string>
using namespace std;
int main() {
    char target;
    string str;
    cin >> target >> str;
    int count = 0;
    for (char c : str) {
        if (c == target) {
            count++;
        }
    }
    cout << count << endl;
    return 0;
}

数组元素求和

输入5个整数存入数组，输出它们的和。

输入样例：1 2 3 4 5

输出样例：15

#include <iostream>
using namespace std;
int main() {
    int arr[5];
    int sum = 0;
    for (int i = 0; i < 5; i++) {
        cin >> arr[i];
        sum += arr[i];
    }
    cout << sum << endl;
    return 0;
}

字母大小写转换

输入一个字母，输出其大小写形式（如A→a，b→B）。

输入样例：D

输出样例：d

#include <iostream>
using namespace std;
int main() {
    char ch;
    cin >> ch;
    if (ch >= 'A' && ch <= 'Z') {
        ch = ch + 32;
    } else if (ch >= 'a' && ch <= 'z') {
        ch = ch - 32;
    }
    cout << ch << " using namespace std";
    return 0;
}

华氏度转摄氏度

#include <iostream>  
using namespace std;  
int main() {  
    float f;  
    cin >> f;  
    cout << 5.0 / 9 * (f - 32);  
    return 0;  
}

求1到n的和

#include <iostream>  
using namespace std;  
int main() {  
    int n, sum = 0;  
    cin >> n;  
    for(int i=1; i<=n; i++) sum += i;  
    cout << sum;  
    return 0;  
}

计算矩形面积

#include <iostream>  
using namespace std;  
int main() {  
    int length, width;  
    cin >> length >> width;  
    cout << length * width;  
    return 0;  
}

反向输出数字

#include <iostream>  
using namespace std;  
int main() {  
    int n, reversed = 0;  
    cin >> n;  
    while(n > 0) {  
        reversed = reversed * 10 + n % 10;  
        n /= 10;  
    }  
    cout << reversed;  
    return 0;  
}

求两数的最大公约数

#include <iostream>  
using namespace std;  
int main() {  
    int a, b;  
    cin >> a >> b;  
    while(b != 0) {  
        int temp = b;  
        b = a % b;  
        a = temp;  
    }  
    cout << a;  
    return 0;  
}

数据统计程序示例（计算一组数的平均值和总和）

#include <iostream>
using namespace std;
int main() {
    int n;
    cout << "请输入数字的个数: ";
    cin >> n;
    int sum = 0;
    for (int i = 0; i < n; i++) {
        int num;
        cout << "请输入第 " << i + 1 << " 个数字: ";
        cin >> num;
        sum += num;
    }
    double average = static_cast<double>(sum) / n;
    cout << "总和: " << sum << endl;
    cout << "平均值: " << average << endl;
    return 0;
}

输出九九乘法表

#include <iostream>  
using namespace std;  
int main() {  
    for(int i=1; i<=9; i++) {  
        for(int j=1; j<=i; j++) {  
            cout << j << "*" << i << "=" << i*j << " ";  
        }  
        cout << endl;  
    }  
    return 0;  
}

小型游戏程序示例（猜数字游戏）

#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
int main() {
    srand(time(0));
    int secretNumber = rand() % 100 + 1;
    int guess;
    int attempts = 0;
    cout << "欢迎来到猜数字游戏！我已经想好了一个1到100之间的数字，你可以开始猜啦。" << endl;
    do {
        cout << "请输入你的猜测: ";
        cin >> guess;
        attempts++;
        if (guess > secretNumber) {
            cout << "猜大了，再试试。" << endl;
        } else if (guess < secretNumber) {
            cout << "猜小了，再试试。" << endl;
        } else {
            cout << "恭喜你，猜对了！你一共用了 " << attempts << " 次尝试。" << endl;
        }
    } while (guess != secretNumber);
    return 0;
}
#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
int main() {
    srand(static_cast<unsigned int>(time(nullptr)));
    int secretNumber = rand() % 100 + 1;
    int guess;
    cout << "欢迎来到猜数字游戏！我已经想好了一个1到100之间的数字，你可以开始猜啦。" << endl;
    do {
        cout << "请输入你的猜测: ";
        cin >> guess;

        if (guess > secretNumber) {
            cout << "猜大了，再试试。" << endl;
        } else if (guess < secretNumber) {
            cout << "猜小了，再试试。" << endl;
        } else {
            cout << "恭喜你，猜对了！" << endl;
        }
    } while (guess != secretNumber);

    return 0;
}

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