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<td>void iof_clrscr(void) </td>
<td>Clears the screen and leaves the cursor in the upper left-hand corner of the screen. </td>
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<td>void iof_flush(void)</td>
<td>Ensures that any output sent to the screen is displayed on the screen (that is, this function flushes the output buffer).</td>
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<td>int iof_getch(void) </td>
<td>Returns the virtual key code identifying the key pressed by the user. </td>
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