Get the current system free memory

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

int main(void)
{
  char *p;
  long l;

  l = 0;
  do {
    p = malloc(1000);
    if(p) 
        l += 1000;
  } while(p);

  printf("Approximately %ld bytes of free memory.", l);

  return 0;
}

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Get the current system free memory : Memory Allocation « Memory « C / ANSI-C

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