CODEWITHSUNDEEP
cinputiostream
blaz1nthunder
blaz1nthunder

Reputation: 53

How to check if next input is empty?

I'm trying to redirect a file as stdin input (one of the requirements). I can't figure out how to check if the next input is empty or if it's done.

something like this

./a.out program < file.txt

So here is what I am trying to do.

char string[10];

while ( the input is NOT empty)
{
    scanf("%s",&string);
    printf("%s",string);
}

The given file looks something like this

abc
abcd
abcde
abcdef

Upvotes: 2

Views: 2383

Answers (2)

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 726499

You can call feof on stdin:

while (!feof(stdin)) {
    scanf("%s", string); // You do not need & for strings
    printf("%s",string);
}

Upvotes: 2

Rodrigo Siqueira
Rodrigo Siqueira

Reputation: 375

If you do the following, it will only stop when scanf cannot read anything else.

while( scanf("%s", string) != EOF ){
    printf("%s", string);

}

By the way to scan a string we cannot make use of & as it already is a pointer.

Upvotes: 2

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