vs2019 E0020 未定义标识符 "SECONDS_PER_YEAR"

Question

我不是定义了么
代码如下
#include<stdio.h>
int main(void)
{
int year = 0;
printf("How old are you:");
scanf_s("%d", &year);
getchar();
double live_seconds = year * SECONDS_PER_YEAR;
printf("You have live %f days\n", live_seconds);
printf("You have live %le days\n", live_seconds);
return 0;
}

E0020 未定义标识符 "SECONDS_PER_YEAR"

错误 C2065 “SECONDS_PER_YEAR”: 未声明的标识符

Answer 1

你再哪定义了啊？
你得增加
#define SECONDS_PER_YEAR 365 * 24 * 60 * 60