Opening and Closing Files

• First define a file pointer, which can "pointing" to one of the opened file.

  #include <stdio.h>
  
  . . .
  FILE *fp;

• Use fopen() to open a file, which returns a file pointer.

  fp = fopen(name, mode);
  
  where name is a string for the file's name, and mode is a string among "r" (for read only), "w" (for write only), etc.
  

• Close the file with

  fclose(fp);
  

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