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            Summary
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             I/O provided by stdio.h, not language itself | 
           
          
             Character I/O: putchar(), getchar(), getc(), putc(), etc. | 
           
          
             String I/O: puts(), gets(), fgets(), fputs(), etc. | 
           
          
             Formatted I/O: fprintf(), fscanf(), etc. | 
           
          
             Open and close files: fopen(), fclose() | 
           
          
             File read/write position: feof(), fseek(), ftell(), etc. | 
           
          
             Error Handling: stderr, exit(). | 
           
          
             Storage Management: malloc(), calloc(), free() | 
           
           
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