binaryStopWatch.c

#include <stdio.h>
#include <unistd.h>

void toBinary(int num, int pInt[5]);

int main() {
    // endless loop counting the time in seconds
    int second_10th = 0;
    int second_1st = 0;

    int minute_10th = 0;
    int minute_1st = 0;
    while (1) {
        // turn the num into an array of binary digits
        int binary_second_10th[5];
        int binary_second_1st[5];
        toBinary(second_10th, binary_second_10th);
        toBinary(second_1st, binary_second_1st);

        int binary_minute_10th[5];
        int binary_minute_1st[5];
        toBinary(minute_10th, binary_minute_10th);
        toBinary(minute_1st, binary_minute_1st);

        // print the binary array
        printf("Time: %d%d:%d%d = ", minute_10th, minute_1st, second_10th, second_1st);

        for (int j = 4; j >= 0; j--) {
            printf("%d", binary_minute_10th[j]);
        }
        printf(" ");
        for (int j = 4; j >= 0; j--) {
            printf("%d", binary_minute_1st[j]);
        }
        printf(":");

        for (int j = 4; j >= 0; j--) {
            printf("%d", binary_second_10th[j]);
        }
        printf(" ");
        for (int j = 4; j >= 0; j--) {
            printf("%d", binary_second_1st[j]);
        }
        printf("\n");

        // increment the seconds
        second_1st++;
        if (second_1st == 10) {
            second_1st = 0;
            second_10th++;
        }

        if (second_10th == 6) {
            second_10th = 0;
            minute_1st++;
        }

        if (minute_1st == 10) {
            minute_1st = 0;
            minute_10th++;
        }

        sleep(1);
    }

    return 0;
}

void toBinary(int num, int pInt[5]) {
    int i = 0;

    while (num > 0) {
        pInt[i] = num % 2;
        num /= 2;
        i++;
    }

    while (i < 5) {
        pInt[i] = 0;
        i++;
    }
}