double get_time(){	struct timeval t;	gettimeofday(&t, NULL);	double d = t.tv_sec + (double) t.tv_usec/1000000;	return d;}...double time_start = get_time();...double time_end = get_time();printf("This program has run for: %f seconds.\n",  time_end - time_start); #include
    
     #include
     
      void do_something(){	for(int i=0;i<100000;i++)		for(int j=0;j<10000;j++)			;}int main(int arg,char ** argv){	clock_t start=clock();	do_something();	clock_t end=clock();	float time=(float)(end-start)/CLOCKS_PER_SEC;	printf("%f\n",time);	return 0;}