Exercise 1-7 (Print EOF)

Chapter_1     Exercise_1-6

copyEOF     Exercise_1-8

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Exercise 1-7     K&R, p. 17

Exercise 1-7. Write a program to print the value of EOF.

eof.c         download

#include <stdio.h> // for putchar(), printf(), EOF

// print the value of EOF, as defined by stdio.h

int main()
{
// putchar(EOF); putchar('\n'); // EOF == -1 is converted to max char 255
// putchar(255); putchar('\n'); // (modulo 2 arithmetic)
printf("EOF = %d\n", EOF); // print as integer
}
/*
gcc -E eof.c // preprocessing
# 5 "eof.c"
int main()
{
printf("EOF = %d\n",
# 9 "eof.c" 3 4
(-1) // EOF macro replaced (expanded)
# 9 "eof.c"
);

gcc eof.c -o eof // compiling
./eof
EOF = -1
*/

Note:

EOF is printed as an integer, not as a character, as in
putchar(EOF); putchar('\n');
The argument of  putchar() is an  unsigned char, varying from 0 to 255, see Exercise_2-1.

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Chapter_1     Exercise_1-6

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copyEOF     Exercise_1-8