CODEWITHSUNDEEP
c
Abirafdi Raditya Putra
Abirafdi Raditya Putra

Reputation: 997

C, while loop keeps repeating

so I built a very basic program according to The C Programming Language book, but when I run it, it keeps asking input after I enter one, the loop should ended when there are no inputs longer right? or Am I wrong? srry for my bad english

int main()
{
    long nc;
    nc = 0;

    while ( getchar() != EOF) {
    ++nc;
    }
    printf("%ld\n", nc);
}

Upvotes: 0

Views: 746

Answers (4)

user2586399
user2586399

Reputation: 1

You can press the Ctrl + D to input EOF, anything other keyboard can't! So if you want to interrupt the loop, you must input the EOF.

Upvotes: 0

Chris Dodd
Chris Dodd

Reputation: 126488

This will keep reading input until it gets to an end-of-file. If you're reading from the terminal (you haven't redirected the program to read from a file), it will only get an EOF if you explicitly give it one. How you do that dpends on your OS, but on most UNIX-like systems, you can generate an explicit eof by hitting ctrl-D

Upvotes: 0

Bin Wang
Bin Wang

Reputation: 2747

No.

For standard input, you must input EOF manually. It's Ctrl+Z in Windows and Ctrl+D in Linux.

If you are using Linux and redirect standard input from file. It will end.

Upvotes: 1

tzaman
tzaman

Reputation: 47840

Your loop is expecting an EOF character to terminate, not just an empty string. *nix consoles typically translate a Ctrl-D on an empty line as EOF, in Windows I believe it's Ctrl-Z but I could be wrong.

Upvotes: 2

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