🦄 refactor(C14, C15):

C14-文件系统/fs/100days.c

@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#define TIMESTRSIZE 128
+
+/**
+ * @brief    找出100天以后是哪一天
+ * @details
+ *
+ * @param    argc
+ * @param    argv
+ *
+ * @return  int
+ */
+int main(int argc, char **argv)
+{
+    time_t     stamp;
+    struct tm *tm;
+    char       timestr[TIMESTRSIZE];
+
+    time(&stamp);
+    tm = localtime(&stamp);
+    strftime(timestr, TIMESTRSIZE, "Now: %Y-%m-%d", tm);
+    puts(timestr);
+
+    tm->tm_mday += 100;
+    //  mktime 会先调整tm溢出的情况
+    mktime(tm);
+    strftime(timestr, TIMESTRSIZE, "100 days later: %Y-%m-%d", tm);
+    puts(timestr);
+
+    exit(0);
+}