Output your results to a file

• In UNIX, you can use a ">" to redirect the output of a program to a file:

  myprogram > output.txt
  

  Remember your program will still be expecting input from the keyboard.
• Another strategy is modify your program. In C, this is done--more or less--in the following manner:

   
  #include <stdio.h>
  FILE fs;                     /* declare the stream fs */
  fs=fopen("output.txt","w");  /* open the file */
  fprintf(fs," %f %f",x0,y0);  /* write x0 and y0 to the file */
  fclose(fp);
  

• In C++, this looks like:

   
  #include <fstream.h>
  ofstream fs;                  /* declaration of stream fs */
  fs.open("file.out");          /* opens file "file.out" */
  fs << "Hello, file" << endl;  /* now write to the file */
  fs.close();                   /* close file */