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#include <stdio.h>
#include <time.h>
int main( voID )
{
time_t start, finish, Now;
struct tm *ptr;
char *c, buf1[80];
double duration;
/* Record the time the program starts execution. */
start = time(0);
time(&Now);
/* Convert the time_t value into a type tm structure. */
ptr = localtime(&Now);
/* Create and display a formatted string containing the current time. */
c = asctime(ptr);
puts(c);
getc(stdin);
/* use the strftime() function to create several different formatted versions of the time. */
strftime(buf1, 80, "This is week %U of the year %Y", ptr);
puts(buf1);
getc(stdin);
strftime(buf1, 80, "Today is %A, %x", ptr);
puts(buf1);
getc(stdin);
strftime(buf1, 80, "It is %M minutes past hour %I.", ptr);
puts(buf1);
getc(stdin);
/* Now get the current time and calculate program duration. */
finish = time(0);
duration = difftime(finish, start);
printf("\nProgram execution time using time() = %f seconds.", duration);
/* display program duration in hundredths of seconds using clock(). */
printf("\nProgram execution time using clock() = %ld hundredths of sec.", clock());
return 0;
}
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