Thread: Why is fflush needed here?

  1. #1
    Registered User
    Join Date
    Aug 2003

    Why is fflush needed here?

    OK, this is a part of a program that I wrote:

    #include <stdio.h>
    #include <string.h>
    struct info {
    	char firstname[20+1];
    	char lastname[25+1];
    	float score;
    int main() {
    	struct info student;
    	do {
    		printf("Type in the name: ");
    		if (strlen(student.firstname)==0) break;
    		printf("Type in the last name: ");
    		printf("Type in the score: ");
    		scanf("%f", &student.score);
    	} while (1);
    	return 0;
    It didn't work this way (it allows me to enter data only once), so I put fflush(stdin) for no particular reason and now it works. Why is that?

  2. #2
    Just Lurking Dave_Sinkula's Avatar
    Join Date
    Oct 2002
    Last edited by Dave_Sinkula; 11-11-2004 at 05:19 PM. Reason: Added more links.
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

  3. #3
    Code Goddess Prelude's Avatar
    Join Date
    Sep 2001
    >Why is that?
    You're lucky.
    My best code is written with the delete key.

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