The difftime() is a C Library function. It computes the difference between two calendar times (time1 – time0 ) in seconds. The difftime function is present in the <time.h> header file.
Syntax of difftime:
The prototype of the difftime function is below:
double difftime(time_t time1, time_t time0);
Parameters:
The difftime function takes two time_t
objects as parameters. They are the following:
time1 − This is the end time.
time0 − This is the start time.
Returns:
The difftime function returns the difference expressed in seconds as a double.
Example Program:
The below code explains how to use the difftime function in C.
#include <stdio.h> #include <time.h> #include <unistd.h> int main() { //variables time_t endTime, startTime; double timeDifference; //get the Current time printf("Starting program execution...\n\n"); time(&startTime); //Pause program printf("Pausing execution for 6 seconds...\n\n"); sleep(6); //get the Current time after sleep time(&endTime); //Compute the timeDifference in times timeDifference = difftime(endTime, startTime); printf("Time difference is %.2f seconds\n", timeDifference); return 0; }
Output:
Starting program execution... Pausing execution for 6 seconds... Time difference is 6.00 seconds
How does the above code work?
In the above code, created two time_t
objects to store the times. When the program starts execution, the time() function stores the current time in the startTime variable.
time_t endTime, startTime; double timeDifference; //get the Current time printf("Starting program execution...\n\n"); time(&startTime);
After the execution of the code, I am calling the sleep() function to pause the code for 6 seconds. And once the program resumes, again call the time() function to store the current time in the variable endTime.
//Pause program printf("Pausing execution for 6 seconds...\n\n"); sleep(6); //get the Current time after sleep time(&endTime);
Now in the last calling the difftime function computes the difference between the times stored in startTime and endTime in seconds.
//Compute the timeDifference in times timeDifference = difftime(endTime, startTime);
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