difftime

Syntax

#include <time.h> double difftime(time_t t1, time_t t0);

Description

This function returns the difference in time, in seconds, from t0 to t1.

Return Value

The number of seconds.

Portability

ANSI/ISO C	C89; C99
POSIX	1003.2-1992; 1003.1-2001

Example

time_t t1, t0; double elapsed; time(&t0); do_something(); time(&t1); elapsed = difftime(t1, t0);