Thread: clock_gettime problem

Good morning. I wrote the following code:

Code:

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

struct timespec ts;

int main() 
{ 
  int value;
  srand(clock_gettime(CLOCK_REALTIME, &ts));
  value = rand();    
  printf("\nThe value: %d\n", value);    
  return 0;    
}

I try to get a random int but I always get the same value when I compile the program with gcc -g rand.c -o rand -lrt

The value: 1804289383

What am I doing wrong?

I already tried with CLOCK_MONOTONIC too.

clock_gettime() returns an int value of 0 to indicate success (and an int value of -1 to indicate failure). It is that 0 value that you are using to initialize the PRNG.

I suggest you redo your program to use (parts of) the structure ts.

I got it. Many thanks

Code:

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

int main() 
{ 
  int value;
  srand(time(NULL));
  value = rand();    
  printf("\nThe value: %d\n", value);    
  return 0;    
}