#include <stdio.h>
#include <sys/time.h>
#define DEBUG 1 //Constant is defined for true
int main()
{
struct timeval start,end; //to store time of starting and ending of program
//if statement is added
if(DEBUG){
gettimeofday(&start,0);
}
printf("Time in microsecond for every second: \n"); //output
for(int i=0;i<100;i++) //outer loop to run 100 times
{
struct timeval loopstart,loopend; //to store time of starting and ending of loop
//if statement added
if(DEBUG){
gettimeofday(&loopstart,0); //measuring time at start of loop
}
for(int j=0;j<1000000;j++); //outer loop to run 1000000 times
//if statement added
if(DEBUG){
gettimeofday(&loopend,0); //measuring time at end of loop
}
//calculating time for one iteration
long ms=(loopend.tv_sec-loopstart.tv_sec)*1000000 + loopend.tv_usec-loopstart.tv_usec;
printf("%ld\n",ms); //output
}
//if statement added
if(DEBUG){
gettimeofday(&end,0);
}
long ms=(end.tv_sec-start.tv_sec)*1000000 + end.tv_usec-start.tv_usec; //calculating time for whole program
printf("Time for entire program: %ld\n",ms); //output
return 0;
}
################################################
#include <stdio.h>
#include <sys/time.h>
#define DEBUG 0 //for false
int main()
{
struct timeval start,end; //to store time of starting and ending of program
//if false is applied
if(DEBUG){
gettimeofday(&start,0);
}
printf("Time in microsecond for every second: \n"); //output
for(int i=0;i<100;i++) //outer loop to run 100 times
{
struct timeval loopstart,loopend; //to store time of starting and ending of loop
//if false is applied
if(DEBUG){
gettimeofday(&loopstart,0); //measuring time at start of loop
}
for(int j=0;j<1000000;j++); //outer loop to run 1000000 times
//if false is applied
if(DEBUG){
gettimeofday(&loopend,0); //measuring time at end of loop
}
//calculating time for one iteration
long ms=(loopend.tv_sec-loopstart.tv_sec)*1000000 + loopend.tv_usec-loopstart.tv_usec;
printf("%ld\n",ms); //output
}
//if false is applied
if(DEBUG){
gettimeofday(&end,0);
}
long ms=(end.tv_sec-start.tv_sec)*1000000 + end.tv_usec-start.tv_usec; //calculating time for whole program
printf("Time for entire program: %ld\n",ms); //output
return 0;
}
Homework Answers
The solution to the above question is given below with screenshot of output.
=====================================================
I kept the logic simple and i have tested all outputs.
If there is anything else do let me know in comments.
=====================================================
============ CODE TO COPY ==============================
main.c
#include <stdio.h>
#include <sys/time.h>
#define DEBUG 1 //Constant is defined for true
int main()
{
struct timeval start, end; //to store time of starting and ending of program
//if statement is added
#ifdef DEBUG
gettimeofday(&start, 0);
#endif
printf("Time in microsecond for every second: \n"); //output
for (int i = 0; i < 100; i++) //outer loop to run 100 times
{
struct timeval loopstart, loopend; //to store time of starting and ending of loop
//if statement added
#ifdef DEBUG
gettimeofday(&loopstart, 0); //measuring time at start of loop
#endif
for (int j = 0; j < 1000000; j++); //outer loop to run 1000000 times
//if statement added
#ifdef DEBUG
gettimeofday(&loopend, 0); //measuring time at end of loop
#endif
//calculating time for one iteration
long ms = (loopend.tv_sec - loopstart.tv_sec) * 1000000 + loopend.tv_usec - loopstart.tv_usec;
printf("%ld\n", ms); //output
}
//if statement added
#ifdef DEBUG
gettimeofday(&end, 0);
#endif
long ms = (end.tv_sec - start.tv_sec) * 1000000 + end.tv_usec - start.tv_usec; //calculating time for whole program
printf("Time for entire program: %ld\n", ms); //output
return 0;
}
=====================================================
Output :
When DEBUG 1
Time in microsecond for every second:
5937
5731
2877
2727
2724
2710
2695
2722
4103
2705
2716
2725
4089
2704
2714
4099
2726
2692
2713
2719
2860
2952
2699
4628
2703
2692
2704
2719
4101
2725
2715
2721
4103
2693
2700
2713
2724
2700
4596
2696
2724
2724
2704
2718
2724
2699
2720
2724
2700
2720
2724
2698
2713
2700
2700
2807
2791
2750
2773
2696
2694
2708
2729
2714
2700
2729
2724
2706
2717
2720
2701
2718
2724
2699
2713
2724
2700
2713
2724
2695
2714
2727
2724
2709
2726
2724
2707
2722
2725
2708
2720
2725
2703
2731
2693
2703
2717
2705
2704
2695
Time for entire program: 289250
When DEBUG 0
Time in microsecond for every second:
2692
2707
3096
3123
2770
3101
2708
2873
2709
3071
2857
2692
2716
2696
2725
2712
4943
3524
3513
4971
3513
3517
4925
3513
3517
5433
3505
3565
3524
3504
3529
3538
3540
3544
3618
3522
4901
3542
3513
3514
3526
5448
3504
3518
4920
3513
3514
3535
3528
5446
3508
3505
3529
3541
3593
3541
3549
3512
3508
3518
3529
3527
3536
3542
3522
3542
3507
3517
3528
3529
4736
2701
2724
2697
4837
3505
3522
3529
3530
3533
5441
3504
3526
3568
3537
3543
3515
3510
3513
3519
3529
3531
3535
3544
3542
3505
3510
3519
3522
3527
Time for entire program: 356438
Add Answer to:
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struct timeval loopstart,loopend; //to store time of starting
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