Rules of automatic flushing stdout buffer is implementation-defined (ID). It is ID when the stream is unbuffered, fully buffered, or line buffered. When a stream is unbuffered, characters are intended to appear from the source or at the destination as soon as possible. Otherwise characters may be accumulated and transmitted to or from the host … Read more
Why use freopen()? The C89 specification has the answer in one of the endnotes for the section on <stdio.h>: 116. The primary use of the freopen function is to change the file associated with a standard text stream (stderr, stdin, or stdout), as those identifiers need not be modifiable lvalues to which the value returned … Read more
The Beginner’s C Input Primer Text mode vs. Binary mode Check fopen() for failure Pitfalls Check any functions you call for success EOF, or “why does the last line print twice” Do not use gets(), ever Do not use fflush() on stdin or any other stream open for reading, ever Do not use *scanf() for … Read more
I think you can do this with a fixed number of variables. Like int p, a, ans=1; scanf(“%d”, &p); //read number for(int r=0; r<p; ++r) { scanf(“%d”, &a); if(a==0) { ans=0; break; } } printf(“\nAnswer is: %d”, ans); ans variable holds the answer. First you read the number of ints into p and then read … Read more
First the issue: the default tty mode is canonical, meaning input is made available line by line (see man termios) Once you fix that, you can use getchar() or read() to get one character at a time. The tty setting, example straight out of the man page of termios . #include <stdio.h> #include <termios.h> int … Read more