I created a program in c which print out a statement , then after some second it clear and replace with a new printed statement

Question

The program is interactive.... But after putting scanf it cannot clear the first statement, anyone knows the solution

char firstn[100];
char secondn[100];
printf("\n\bPlease Enter Your First Name:  ");
scanf("%s", &firstn );
fflush(stdout);
Sleep(1234);
printf("\r\bPlease Enter Your Second Name: ");
scanf("%s", &Secondn);

What is the return value of your scanf calls? And what does that mean according to scanf documentation? — Yunnosch, Sep 30 '17 at 18:41
char is good for storing 1 character like 'a'. For C-strings you need and array of char: `char firstn[100];` and you read it using `scanf("%99s", firstn)` — Artemy Vysotsky, Sep 30 '17 at 18:42
What does scanf documentation say about the paramters after the format string? Does it need the value of a suitable variable, or somethign else? — Yunnosch, Sep 30 '17 at 18:43
When dealing with scanf() be sure to first study the extremely helpful http://sekrit.de/webdocs/c/beginners-guide-away-from-scanf.html — Yunnosch, Sep 30 '17 at 18:44
I assume he means removing the first printed line. @Yunnosch, which I answered. — Rivasa, Sep 30 '17 at 18:46
You did not post the actual code you have a problem with. Please create a [mcve]. — Yunnosch, Sep 30 '17 at 18:47

Rivasa · Accepted Answer · 2017-09-30T20:22:36.443

1

To clear the screen you can use:

... // Other headers
#include <stdlib.h>

int main{
   ... // Code
   system("clear"); // or system("cls"); on Windows.
   ... // Code
}

And this should work for your purposes.

If you need to clear a specific line only, you can use ncurses as this Q&A demonstrates.

edited Sep 30 '17 at 20:22

answered Sep 30 '17 at 18:45

Rivasa

6,510
3
35
64

Nice code bro.... Is there a way to limit the point of Line at which system must clear – joshmat Sep 30 '17 at 18:47
Or any other OS where clear isn't a command that can be run independently. There is no prtable way to clear the screen. https://stackoverflow.com/questions/18154579/how-do-i-clear-the-screen-in-c – Jerry Jeremiah Sep 30 '17 at 19:45
@AlarmedDino My comment with `system("cls");` should work fine. – Rivasa Sep 30 '17 at 20:20
@jmt See my extra note. – Rivasa Sep 30 '17 at 20:22
Ohh thanks allot... Can we be friends on Facebook @Annabelle – joshmat Oct 03 '17 at 20:31

I created a program in c which print out a statement , then after some second it clear and replace with a new printed statement

1 Answers1