Check out example codes for "sleep in c". It will help you in understanding the concepts better.

Code Example 1

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
 
int main(){
  
	printf("Sleeping for 5 seconds \n");
	sleep(5);
	printf("Sleep is now over \n");  
}

Code Example 2

//sleep function provided by <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
 
int main(){
  
	printf("Sleeping for 5 seconds \n");
	sleep(5);
	printf("Wake up \n");  
}

Code Example 3

sleep(5); //sleep for 5 secs

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