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

// Try running this and check the contents of MyFile.txt
// Then uncomment the //fflush(fp) line recompile and rerun, then check
// the contents of MyFile.txt
// Writing to a file is fully buffered

int main(void){ 
   FILE * fp = fopen("MyFile.txt","w");
   fprintf(fp,"Important information\n");  
   //fflush(fp);
   int *p = NULL;
   *p = *p + 1;
   
   fclose(fp); //flush the buffer
   return 0;
}