CODEWITHSUNDEEP
c
BionicEdit
BionicEdit

Reputation: 25

print out the total usable memory available

This is what I currently have but I'm doing it wrong. Can someone please explain how to format the output into GB? I have a total of 16GB of available ram and I'm getting an output of 62GB.

#include <stdio.h>
#include <sys/sysinfo.h>

int main(void) {
  struct sysinfo sys_info; // for system information
  sysinfo(&sys_info); // to get system information
  
  printf("Total usable memory size: %ldGB", sys_info.totalram / 1024 / 1024 / 1024);

  return 0;
}

Upvotes: 0

Views: 382

Answers (1)

zensayyy
zensayyy

Reputation: 38

First note that sysinfo will actually already give you the size in kB (KiloBytes). That means that you actually divide by 1000.0 to get GB (GigaByte). Also I think you would want your output to be double precision.

I modified your code

#include <stdio.h>
#include <sys/sysinfo.h>

int main(void) {

  struct sysinfo sys_info; // for system information
  sysinfo(&sys_info); // to get system information
  // note: %.3f is double precision but I only need to display 3 decimal places
  printf("Total usable memory size       : %.3fGB", sys_info.totalram / 1000.0 / 1000.0 / 1000.0);


  return 0;
}

Don't be confused when you try to verify this using cat /proc/meminfo. This is actually displaying the total memory in KibiBytes. One KibiByte is 1.024 KiloByte. You can do the math and it will also end up in the same solution.

Upvotes: 1

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