q3.c

#include <stdio.h>

int h, m, s, n;
int total_s;

int to_timestamp(int h, int m, int s) {
    return (h * (60 * 60)) + (m * 60) + s;
}

void to_hms_tuple(int timestamp, int *h, int *m, int *s) {
    *h = timestamp / (60*60);
    timestamp %= (60 * 60);
    *m = timestamp / 60;
    timestamp %= 60;
    *s = timestamp;
}

int main() {
    printf("Enter hour: ");
    scanf("%d", &h);
    printf("Enter minute: ");
    scanf("%d", &m);
    printf("Enter second: ");
    scanf("%d", &s);

    printf("Enter n: ");
    scanf("%d", &n);
    
    int new_h, new_m, new_s;
    int new_timestamp = to_timestamp(h, m, s) + n;
    to_hms_tuple(new_timestamp, &new_h, &new_m, &new_s);

    printf("New date is %dh, %dm, %ds\n", new_h, new_m, new_s);
}