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cfgetc

fgetc() exits on second input?

I was experimenting with C's fgetc() and ran into a strange problem. I typed the following code below:

    int answer = 0;

    printf("Input1\n");

    answer = fgetc(stdin);
    printf("%c\n", answer);

    printf("Input2\n");
    answer = fgetc(stdin);
    printf("%c\n", answer);

However, every time I enter a value other than a space, this happens:

 Input1
 1
 1
 Input2 # It doesn't wait for my input here

Could anyone tell me what I'm doing wrong? I've tried flushing stdin and I've also tried using rewind on stdin. However, none of these work.

Solution

  • If you type in 1 followed by enter, there is \n char at the end of input. The second fgetc will read the \n character.

    For debugging (as suggested in comments) you can replace printf("%c\n", answer) with 

    printf("Got %d (%c)\n", answer, (isprint(answer) ? answer : '.'));

    The result should be:

    Input1
1
Got 49 (1)
Input2
Got 10 (.) <- new line