strftime Function in C Programming Language Video Tutorial

In this C programming language video tutorial / lecture for beginners video series, you will learn about usage of strftime() function in c programming to format the date and time as you want in detail with example..

This video begins with the explanation of the strftime function including its syntax, parameters required and then explains the format specifiers or the format commands available for the strftime function and also explains how to use this function to format the date and time with an example in detail.

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[samueljohn]

How to make the program overwrite its current time...I mean, to make the clock run continuously without having to start the program again or pressing enter..

[tamzidmahmud]

#include<stdio.h>
#include<time.h>

/**
size_t strftime(char *str, size_t maxsize, const char *fmt, const struct tm *time);

%A Full weekday name
%B Full month name
%c Standard date and time string
%H Hour (0-23)
%I Hour (1-12)
%p Locale's equivalent of AM or PM
%M Minute as decimal (0-59)
%S Second as decimal (0-60)
%X Standard time string
%Z Time zone name
*/
int main()
{
struct tm *ptr;
time_t t;
char str[100];

t = time(NULL);
ptr = localtime(&t);

strftime(str, 100, "It is now %I %P %M minutes %S seconds\ntime zone is %Z", ptr);
puts(str);
return 0;
}

its printing nothing.
what's the problem?