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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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<tr>
<td>void iof_movecur(int r, int c) </td>
<td>Positions the cursor at row r and column c, where row 0 is the top row and column 0 is the leftmost column.</td>
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<td>void iof_putch(int c)</td>
<td>Displays the character c at the current cursor position and advances the cursor by one position to the right. </td>
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<td>void iof_prnstr(const char *s) </td>
<td>Displays the null-terminated string pointed to by s starting at the current cursor position.</td>
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</table>