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


int main()
{
  char * filename = "C:/users/athitsos/temp/hello.txt";

  // open a file for writing
  // caution: if the file already exists, this line
  // erases all current contents.
  FILE * file1 = fopen(filename, "w");

  // write some text into the file.
  fprintf(file1, "hello world\n");
  fprintf(file1, "hello again\n");

  // close the file.
  fclose(file1);
}