Pushes back the last character read from the console.
| #include <conio.h> | Required only for function declarations |
int _ungetch( int c );
| c | Character to be pushed |
The _ungetch function pushes the character c back to the console, causing c to be the next character read by _getch or _getche. The _ungetch function fails if it is called more than once before the next read. The c argument may not be EOF.
The _ungetch function returns the character c if it is successful. A return value of EOF indicates an error.
Standards:None
16-Bit:DOS
32-Bit:DOS32X
/* UNGETCH.C: In this program, a white-space delimited token is read
* from the keyboard. When the program encounters a delimiter,
* it uses _ungetch to replace the character in the keyboard buffer.
*/
#include <conio.h>
#include <ctype.h>
#include <stdio.h>
void main( void )
{
char buffer[100];
int count = 0;
int ch;
ch = _getche();
while( isspace( ch ) ) /* Skip preceding white space. */
ch = _getche();
while( count < 99 ) /* Gather token. */
{
if( isspace( ch ) ) /* End of token. */
break;
buffer[count++] = ch;
ch = _getche();
}
_ungetch( ch ); /* Put back delimiter. */
buffer[count] = '\0'; /* Null terminate the token. */
printf( “\ntoken = %s\n”, buffer );
}
White
token = White