Re: printf & scanf order

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Date	Sun, 26 Jun 2011 02:06:09 -0400
From	pete <pfiland@mindspring.com>
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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

Thread

printf & scanf order flebber <flebber.crue@gmail.com> - 2011-06-25 22:09 -0700
  Re: printf & scanf order pete <pfiland@mindspring.com> - 2011-06-26 02:06 -0400
    Re: printf & scanf order "Heinrich Wolf" <invalid@invalid.invalid> - 2011-06-26 14:58 +0200
      Re: printf & scanf order "Heinrich Wolf" <invalid@invalid.invalid> - 2011-06-26 15:16 +0200
        Re: printf & scanf order Ralf Damaschke <rwspam@gmx.de> - 2011-06-26 14:12 +0000
        Re: printf & scanf order "Heinrich Wolf" <invalid@invalid.invalid> - 2011-06-26 16:20 +0200
        Re: printf & scanf order "J. J. Farrell" <jjf@bcs.org.uk> - 2011-06-28 03:59 +0100
  Re: printf & scanf order Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-26 08:27 -0400
  Re: printf & scanf order "Heinrich Wolf" <invalid@invalid.invalid> - 2011-06-26 17:17 +0200

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