根据预测明年的平均工资这段代码int next_year = sample_data[sample_size - 1].year + 1; float next_salary = a * next_year + b; printf("The predicted average salary for %d is %.2f\n", next_year, next_salary);写出一个可以查看任一年的平均工资

可以根据上面的代码稍加修改，让用户输入任意想要查询的年份，然后输出该年份的预测平均工资。具体代码如下：

#include <stdio.h>

#define MAX_SIZE 100

struct salary_data {
    int year;
    float salary;
};

int main() {
    int sample_size, query_year;
    float a, b;

    struct salary_data sample_data[MAX_SIZE];

    // 读入样本数据
    printf("Please enter the number of years for which you have salary data: ");
    scanf("%d", &sample_size);
    printf("Please enter the salary data:\n");
    for (int i = 0; i < sample_size; ++i) {
        scanf("%d %f", &sample_data[i].year, &sample_data[i].salary);
    }

    // 计算线性回归系数
    float x_sum = 0, y_sum = 0, xy_sum = 0, x2_sum = 0;
    for (int i = 0; i < sample_size; ++i) {
        float x = sample_data[i].year, y = sample_data[i].salary;
        x_sum += x;
        y_sum += y;
        xy_sum += x * y;
        x2_sum += x * x;
    }
    a = (sample_size * xy_sum - x_sum * y_sum) / (sample_size * x2_sum - x_sum * x_sum);
    b = (y_sum - a * x_sum) / sample_size;

    // 查询任意年份的预测平均工资
    printf("Please enter the year for which you want to predict the average salary: ");
    scanf("%d", &query_year);
    float predicted_salary = a * query_year + b;
    printf("The predicted average salary for %d is %.2f\n", query_year, predicted_salary);

    return 0;
}

这个程序可以读入任意数量的样本数据，并且计算出对应的线性回归系数。用户可以输入任意想要查询的年份，然后程序会输出该年份的预测平均工资。