🕐📚Intermediate

Print Digital Clock with Current Time

Display running clock

Display a digital clock that updates every second. Uses \\r to overwrite the same line.

Program Code

digital_clock.c

1#include <stdio.h>
2#include <time.h>
3
4#ifdef _WIN32
5    #include <windows.h>
6    #define SLEEP(x) Sleep(x * 1000)
7#else
8    #include <unistd.h>
9    #define SLEEP(x) sleep(x)
10#endif
11
12int main() {
13    time_t now;
14    struct tm *local;
15    
16    printf("Digital Clock (Press Ctrl+C to stop)\n");
17    printf("=====================================\n");
18    
19    while (1) {
20        time(&now);
21        local = localtime(&now);
22        
23        // Print time with carriage return to overwrite
24        printf("\r  %02d:%02d:%02d  ",
25               local->tm_hour,
26               local->tm_min,
27               local->tm_sec);
28        
29        fflush(stdout);  // Force output
30        SLEEP(1);        // Wait 1 second
31    }
32    
33    return 0;
34}