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零基础学C语言：入门必备的100个经典代码实例解析

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1. 初识C语言

C语言是一种广泛使用的计算机编程语言，以其高效性和灵活性著称。对于初学者来说，掌握C语言的基础是学习其他高级编程语言的重要一步。下面，我们将通过100个经典代码实例，帮助你快速入门C语言。

2. C语言基础语法

2.1 变量和数据类型

#include <stdio.h>

int main() {
    int a = 10; // 整数
    float b = 3.14; // 浮点数
    char c = 'A'; // 字符

    printf("a = %d\n", a);
    printf("b = %.2f\n", b);
    printf("c = %c\n", c);

    return 0;
}

2.2 运算符

#include <stdio.h>

int main() {
    int a = 5, b = 3;
    int sum = a + b;
    int sub = a - b;
    int mul = a * b;
    int div = a / b;

    printf("sum = %d\n", sum);
    printf("sub = %d\n", sub);
    printf("mul = %d\n", mul);
    printf("div = %d\n", div);

    return 0;
}

2.3 控制语句

2.3.1 条件语句

#include <stdio.h>

int main() {
    int age = 18;
    if (age >= 18) {
        printf("你已经成年了。\n");
    } else {
        printf("你还没有成年。\n");
    }

    return 0;
}

2.3.2 循环语句

#include <stdio.h>

int main() {
    for (int i = 1; i <= 5; i++) {
        printf("i = %d\n", i);
    }

    return 0;
}

3. C语言进阶

3.1 函数

#include <stdio.h>

void sayHello() {
    printf("Hello, World!\n");
}

int main() {
    sayHello();

    return 0;
}

3.2 指针

#include <stdio.h>

int main() {
    int a = 10;
    int *ptr = &a;

    printf("a = %d\n", a);
    printf("ptr = %p\n", (void *)ptr);
    printf("*ptr = %d\n", *ptr);

    return 0;
}

3.3 数组

#include <stdio.h>

int main() {
    int arr[5] = {1, 2, 3, 4, 5};
    printf("arr[2] = %d\n", arr[2]);

    return 0;
}

3.4 结构体

#include <stdio.h>

typedef struct {
    char name[50];
    int age;
} Person;

int main() {
    Person p = {"张三", 20};
    printf("p.name = %s\n", p.name);
    printf("p.age = %d\n", p.age);

    return 0;
}

4. 实战项目

4.1 计算器

#include <stdio.h>

int main() {
    char operator;
    double firstNumber, secondNumber;

    printf("请输入运算符 (+, -, *, /): ");
    scanf("%c", &operator);

    printf("请输入第一个数: ");
    scanf("%lf", &firstNumber);

    printf("请输入第二个数: ");
    scanf("%lf", &secondNumber);

    switch (operator) {
        case '+':
            printf("%.1lf + %.1lf = %.1lf\n", firstNumber, secondNumber, firstNumber + secondNumber);
            break;
        case '-':
            printf("%.1lf - %.1lf = %.1lf\n", firstNumber, secondNumber, firstNumber - secondNumber);
            break;
        case '*':
            printf("%.1lf * %.1lf = %.1lf\n", firstNumber, secondNumber, firstNumber * secondNumber);
            break;
        case '/':
            if (secondNumber != 0.0)
                printf("%.1lf / %.1lf = %.1lf\n", firstNumber, secondNumber, firstNumber / secondNumber);
            else
                printf("除数不能为0。\n");
            break;
        default:
            printf("未知运算符。\n");
    }

    return 0;
}

4.2 简单游戏

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main() {
    srand(time(NULL));

    int randomNumber = rand() % 100 + 1;
    int userNumber;

    printf("猜一个1到100之间的数字。\n");

    while (1) {
        printf("请输入你的猜测: ");
        scanf("%d", &userNumber);

        if (userNumber == randomNumber) {
            printf("恭喜你，猜对了！\n");
            break;
        } else if (userNumber < randomNumber) {
            printf("太小了，再试一次。\n");
        } else {
            printf("太大了，再试一次。\n");
        }
    }

    return 0;
}

5. 总结

通过以上100个经典代码实例，相信你已经对C语言有了初步的了解。继续努力，你会成为一名优秀的C语言程序员！

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