C program to print digital clock with current time

The time.h header defines four variable types, two macro and various functions for manipulating date and time. A brief description of the variable types defined in the header time.h is as :

Below is the implementation of digital clock. On executing the program, the output window will show the time when the program was executed.

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// C implementation of digital clock
#include <stdio.h>
#include <time.h>
  
// driver code
int main()
{
    time_t s, val = 1;
    struct tm* current_time;
  
    // time in seconds
    s = time(NULL);
  
    // to get current time
    current_time = localtime(&s);
  
    // print time in minutes,
    // hours and seconds
    printf("%02d:%02d:%02d",
           current_time->tm_hour,
           current_time->tm_min,
           current_time->tm_sec);
  
    return 0;
}
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Output :

Below is the C program to show the current time inside a rectangular bar. The output window shows the day, month, date, current time and year.

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// C program to print digital
// clock using graphics
#include <graphics.h>
#include <time.h>
  
// driver code
int main()
{
    // DETECT is a macro defined in
    // "graphics.h" header file
    int dt = DETECT, gmode, midx, midy;
    long current_time;
    char strtime[30];
  
    // initialize graphic mode
    initgraph(&dt, &gmode, "");
  
    // to find mid value in horizontal
    // and vertical axis
    midx = getmaxx() / 2;
    midy = getmaxy() / 2;
  
    // set current colour to white
    setcolor(WHITE);
  
    // make a rectangular box in
    // the middle of screen
    rectangle(midx - 200, midy - 40, midx + 200, 
                                     midy + 40);
  
    // fill rectangle with white color
    floodfill(midx, midy, WHITE);
    while (!kbhit()) {
  
        // get current time in seconds
        current_time = time(NULL);
  
        // store time in string
        strcpy(strtime, ctime(&current_time));
  
        // set color of text to red
        setcolor(RED);
  
        // set the text justification
        settextjustify(CENTER_TEXT, CENTER_TEXT);
  
        // to set styling to text
        settextstyle(SANS_SERIF_FONT, HORIZ_DIR, 3);
  
        // locate position to write
        moveto(midx, midy);
  
        // print current time
        outtext(strtime);
    }
    getch();
  
    // deallocate memory for graph
    closegraph();
}
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Output :

References :
cprogramforbeginners

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