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#include <stdio.h> int ungetc(int c, FILE *file); |
This function pushes c back into the file. You can only push back one character at a time.
The pushed-back character, or EOF on error.
| ANSI/ISO C | C89; C99 |
| POSIX | 1003.2-1992; 1003.1-2001 |
int q; while (q = getc(stdin) != 'q'); ungetc(q); |