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Top Forums Programming Pure C function pointer on printing vowels twice Post 302997630 by Corona688 on Wednesday 17th of May 2017 02:38:09 PM
Old 05-17-2017
Quote:
but I still did not get how putcharTwice( int c) print the chars (now vowels only) twice.
Because putchar isn't returning EOF.
From man putchar:
Code:
RETURN VALUE
       fputc(),  putc()  and  putchar()  return  the  character  written as an
       unsigned char cast to an int, or EOF on error.

So if you're printing C, it ends up testing 'C' == EOF, which evaluates to 0, allowing it to reach the second part, testing 'C' == EOF again, which is false again.
 

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PUTS(3) 						     Linux Programmer's Manual							   PUTS(3)

NAME
fputc, fputs, putc, putchar, puts - output of characters and strings SYNOPSIS
#include <stdio.h> int fputc(int c, FILE *stream); int fputs(const char *s, FILE *stream); int putc(int c, FILE *stream); int putchar(int c); int puts(const char *s); DESCRIPTION
fputc() writes the character c, cast to an unsigned char, to stream. fputs() writes the string s to stream, without its trailing ''. putc() is equivalent to fputc() except that it may be implemented as a macro which evaluates stream more than once. putchar(c); is equivalent to putc(c,stdout). puts() writes the string s and a trailing newline to stdout. Calls to the functions described here can be mixed with each other and with calls to other output functions from the stdio library for the same output stream. For non-locking counterparts, see unlocked_stdio(3). RETURN VALUE
fputc(), putc() and putchar() return the character written as an unsigned char cast to an int or EOF on error. puts() and fputs() return a non-negative number on success, or EOF on error. CONFORMING TO
ANSI - C, POSIX.1 BUGS
It is not advisable to mix calls to output functions from the stdio library with low - level calls to write() for the file descriptor asso- ciated with the same output stream; the results will be undefined and very probably not what you want. SEE ALSO
write(2), ferror(3), fopen(3), fseek(3), fwrite(3), gets(3), scanf(3), unlocked_stdio(3) GNU
1993-04-04 PUTS(3)
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