CODEWITHSUNDEEP
ctime
aclark
aclark

Reputation: 217

Add a Time Stamp to a Program in C

I've been given two sets of C code and I've been asked to use this code:

#include <stdio.h>

void main() {
  int n, c=0;
  scanf("%d", &n);
  while(n != 1) {
    c++;
    if(n%2 == 0)
      n = n/2;
    else
      n = 3*n + 1;
  }
  printf("n = %d\n", n);
  printf("iterations = %d\n", c);
}

Then I have to use this code to add a time stamp to the program above after the input statement and before the end of the program. I have to use this to calculate the number of clock cycles and seconds it takes for the program to execute.

#include <stdio.h>
#include <time.h>

void sleep2(int wait) {
  clock_t goal; // clock_t defined in <time.h>
  goal = wait * CLOCKS_PER_SEC + clock();
  while( goal > clock() )
    ;
}

main() {
  int delay;
  printf("Enter an integer ...\n");
  scanf("%d", &delay);
  printf("To be delayed for %d seconds ...\n", delay);
  sleep2(delay);
  printf("expired\n");
}

I feel like this should be simple, but I'm not sure how to use the code to put in a time stamp. Could someone help me with the code or just get me started?

Thanks!

Upvotes: 2

Views: 3141

Answers (2)

Sean Dawson
Sean Dawson

Reputation: 5786

If it only has to be accurate to the second use time.h. Then you could do something like:

 time_t startT = time(null);
 //stuff
 time_t finalTime = time(null) - startT;

If you need more accuracy see this post: https://stackoverflow.com/a/275231/1153203

Upvotes: 2

MRAB
MRAB

Reputation: 20664

Basically do this:

clock_t start;
clock_t elapsed;

start = clock();
...
elapsed = clock() - start;

elapsed will be the elapsed time in 'ticks', where there are CLOCKS_PER_SEC ticks per second.

Upvotes: 1

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