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NNTP-Posting-Date: Sun, 26 Jun 2011 01:06:09 -0500
Message-ID: <4E06CC51.5204@mindspring.com>
Date: Sun, 26 Jun 2011 02:06:09 -0400
From: pete <pfiland@mindspring.com>
Reply-To: pfiland@mindspring.com
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Subject: Re: printf & scanf order
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.c:6957

flebber wrote:
> 
> Hi
> 
> I am starting to learn c and have been playing with several simple
> scripts to learn.
> 
> Question why does the request for scanf precede printf. I created a
> simple script to calculate interest. When running the script though
> scanf is processed first and the request for input comes first,
> despite being in the second position. How do I get printf to call
> first.
> 
> This is my script.
> 
> # include <stdio.h>
> int main()
> {
>   float a,b,c,interest;
>   printf("Type in amount in dollars cents: \n");
>   scanf("%f",&a);
>   b = 0.075;
>   c = a * b;
>   interest = a + c;
>   printf("The total including interest is $%.2f", interest);
>     return 0;
> }

I'm not sure if I understand your question.
But if I do, then maybe placing
    fflush(stdout);
before your scanf call might solve your problem.

Also, it is best to terminate a text stream 
with a newline character in your last printf call.

# include <stdio.h>

int main(void)
{
    float a, b, c, interest;
    printf("Type in amount in dollars cents: \n");
    fflush(stdout);
    scanf("%f",&a);
    b = 0.075f;
    c = a * b;
    interest = a + c;
    printf("The total including interest is $%.2f\n", interest);
    return 0;
}

(double) is a more natural type than (float).
(double) is not subject to default argument promotions.

# include <stdio.h>

int main(void)
{
    double a, b, c, interest;
    printf("Type in amount in dollars cents: \n");
    fflush(stdout);
    scanf("%lf",&a);
    b = 0.075;
    c = a * b;
    interest = a + c;
    printf("The total including interest is $%.2f\n", interest);
    return 0;
} 

-- 
pete