From: Nate Eldredge <neldredge AT hmc DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Please help me to find out the problem.
Date: 23 Nov 1999 09:39:36 -0800
Organization: InterWorld Communications
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"Jason Yip" <manman AT netteens DOT net> writes:

> The output of this program is always incorrect. Can anyone tells me why and
> correct it?? Thanks a lot!!

Your `total' variable is uninitialized.  So it starts at some random
value, which is then added to, and of course the answer is wrong.  You
should add `total = 0.0' somewhere before the loop.

> What's more, I would like to make the prog to reject -ve input and shows a
> msg, then input again. How can I do?
> (Can I use for loop only?)

A `while' would be simpler...

printf("Input rate");
scanf("%f", &rate);
while (rate < 0.0)
{
  printf("Try again");
  scanf("%f", &rate);
}

> #include <stdio.h>
> main ()
> {
> int i, ppl; float rate, hr, total, pay;
>  printf("Please input how many employees have overtime works: ");
>  scanf("%d",&ppl);
>  for(i=1;i<=ppl;i++){
>  {
>  printf("Please input the overtime hour of the no %d employee: ", i);
>  scanf("%f",&hr);
>  printf("Please input the overtime hourly rate of the no %d employee: ", i);
>  scanf("%f",&rate);
>  pay=hr*rate;
>  }
>  total+=pay;
>  }
>  printf("The total overtime pay is %.2f",total);
>  return 0;
> }
> 
> 

-- 

Nate Eldredge
neldredge AT hmc DOT edu