The C Programming Language, 2nd Edition, by Kernighan and Ritchie
Exercise 1.06 on page 17
Verify that the expression getchar()
!=
EOF
is 0 or 1.
Solution by Richard Heathfield
/* This program prompts for input, and then captures a character * from the keyboard. If EOF is signalled (typically through a * control-D or control-Z character, though not necessarily), * the program prints 0. Otherwise, it prints 1. * * If your input stream is buffered (and it probably is), then * you will need to press the ENTER key before the program will * respond. */ #include <stdio.h> int main(void) { printf("Press a key. ENTER would be nice :-)\n\n"); printf("The expression getchar() != EOF evaluates to %d\n", getchar() != EOF); return 0; }