#include <stdio.h>
 
// 定义数据结构体
typedef struct {
    int year;
    double gdp;  // 单位：万亿元
} GDPData;
 
int main() {
    // 直接在代码中嵌入2020-2022年GDP数据（来源：国家统计局）
    GDPData data[] = {
        {2020, 101.60},
        {2021, 114.37},
        {2022, 121.02}
    };
    int count = sizeof(data) / sizeof(GDPData);  // 自动计算数据条目数
 
    // 输出标题
    printf("年份\tGDP（万亿元）\t同比增长率（%%）\n");
    printf("----------------------------------------\n");
 
    // 计算并输出增长率（从第二年开始计算）
    for (int i = 1; i < count; i++) {
        // 计算增长率：(当年GDP - 前一年GDP) / 前一年GDP * 100
        double growthRate = ((data[i].gdp - data[i-1].gdp) / data[i-1].gdp) * 100;
 
        // 格式化输出（保留两位小数）
        printf("%d\t%.2f\t\t\t%.2f\n", 
               data[i].year, 
               data[i].gdp, 
               growthRate);
    }
 
    return 0;  // 简化返回值，不使用EXIT_SUCCESS宏
}
 

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