The app

alarmclock.c

@@ -0,0 +1,26 @@
+#include <stdio.h>  /* scanf */
+#include <stdint.h> /* uint8_t */
+
+#define CLOCK_FREQUENCY 1023000L
+#define CYCLES_PER_NOOP 2
+#define NOOPS_PER_SEC 511500
+
+enum {
+    ANTE_MERIDIEM, POST_MERIDIEM
+} meridiem_t;
+
+uint8_t curr_hour;
+uint8_t curr_min;
+meridiem_t curr_meridiem;
+
+uint8_t alarm_hour;
+uint8_t alarm_min;
+meridiem_t alarm_meridiem;
+
+void main(void)
+{
+    scanf("Current hour:%2ui", &curr_hour);
+    scanf("Current minute:%2ui", &curr_min);
+    scanf("Current AM/PM:%2s", &meridiem_input);
+}
+