How to measure timings in a C program

Include the header file . 

Time variables have data type clock_t. 

If you want to measure the timimg of a block, note the time t1 just before the block begins and the time t2 just after the block exits. Use the C library call clock() to know a particular time. 

Divide (t2 - t1) by CLOCKS_PER_SEC to get the number of seconds the block took. 

If the block returns too fast so that you get a zero time, repeat the block some number of times (say, 100 or 1000 or ...) and record the timing for these many executions of the block. 

The prototype example

#include /* Include standard i/o header file */

#include  /* Include the timing header file */

...

clock_t t1, t2;    /* Time variables */

int i,             /* Temporary index */

   repCount;       /* Repetition count */

float timeTaken;   /* Total time taken */

...

repCount = 1000;   /* Set repetition count */

t1 = clock();      /* Record timing before the block begins */

/* Execute the block repCount times */

for (i=0; i

Tweet