105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
#include <stdio.h> /* printf, scanf */
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#include <ctype.h> /* toupper */
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#include "12hourclk.h"
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static char *meridiem_text(meridiem_t m)
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{
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if (m == ANTE_MERIDIEM) {
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return "am";
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}
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else {
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return "pm";
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}
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}
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void read_interactively(twleve_hour_clock_t *clock)
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{
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char meridiem_input[3];
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printf("Hour:");
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scanf("%2ui", &(clock->hours));
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printf("Minute:");
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scanf("%2ui", &(clock->minutes));
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printf("AM or PM:");
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scanf("%2s", meridiem_input);
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clock->seconds = 0;
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if (toupper(meridiem_input[0]) == 'A') {
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clock->meridiem = ANTE_MERIDIEM;
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}
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else {
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clock->meridiem = POST_MERIDIEM;
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}
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}
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void add_one_second(twleve_hour_clock_t *clock)
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{
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if (clock->seconds < 59) {
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++(clock->seconds);
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}
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else {
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clock->seconds = 0;
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if (clock->minutes < 59) {
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++(clock->minutes);
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}
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else {
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clock->minutes = 0;
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if (clock->hours < 11) {
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++(clock->hours);
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}
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else if (clock->hours == 11) {
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++(clock->hours);
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if (clock->meridiem == ANTE_MERIDIEM) {
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clock->meridiem = POST_MERIDIEM;
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}
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else {
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clock->meridiem = ANTE_MERIDIEM;
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}
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}
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else {
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clock->hours = 1;
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}
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}
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}
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}
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void add_seconds(twleve_hour_clock_t *clock, uint8_t seconds)
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{
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uint16_t sum;
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uint16_t minutes_carry;
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uint16_t hours_carry;
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sum = ((uint16_t) clock->seconds) + ((uint16_t) seconds);
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if (sum >= 60) {
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minutes_carry = sum / 60;
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clock->seconds = sum % 60;
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sum = ((uint16_t) clock->minutes) + minutes_carry;
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if (sum >= 60) {
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hours_carry = sum / 60;
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clock->minutes = sum % 60;
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sum = ((uint16_t) clock->hours) + hours_carry;
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if (sum >= 12) {
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}
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}
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else {
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clock->minutes = sum;
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}
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}
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else {
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clock->seconds = sum;
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}
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}
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void print_time(twleve_hour_clock_t *clock)
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{
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printf("%2u:%02u:%02u %2s", clock->hours, clock->minutes, clock->seconds, meridiem_text(clock->meridiem));
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}
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void reprint_time(twleve_hour_clock_t *clock)
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{
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printf("\b\b\b\b\b\b\b\b\b\b\b");
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print_time(clock);
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}
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