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Join Date: Nov 2004
Posts: 123
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Junior Poster
this code to convert pounds to barbados dollars given a constant rate the price cannot go over $100 when i first run it and input a number under 100 it tells me that it is invalid and sometimes i get nothing at all. Can neone tell me why?
/* This Program converts Pounds Sterling to Barbados Dollars*/
# include <stdio.h>
int main ()
{
float Pds, Bds; /* Declare Variables*/
const float Rate =3.75;
printf("Enter the Price in Pounds Sterling\n"); /*Prompt User*/
scanf_s("%f", &Pds);
while(Pds >100);/* finds illegal value*/
{
printf("Error your price cannot be greater than $100\n");
printf("Please Enter another\n");
scanf_s("%f",&Pds);
}
Bds=Pds*Rate;
printf("Price in Barbados Dollars=%.2f",Bds);
return 0;
}
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Join Date: Aug 2005
Location: near St Louis, Missouri, USA
Posts: 10,697
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stop using scanf() because it may corrupt the input buffer and leave keys in the keyboard buffer. use fgets() instead
float num;
char buf[16];
printf("blabla");
// get input from user
fgets(buf,sizeof(buf),stdin);
// convert to float
num = atof(buf); Last edited by Ancient Dragon : Oct 7th, 2006 at 8:38 am.
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Join Date: Jun 2005
Location: Novi Sad, Serbia
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Posting Whiz in Training
Hm did U got corrupted code and your task is to fix it?
No?!?! Ok then just remove
No?!?! Ok then just remove
; after while loop. If you want to win, you must not loose (Alan Ford)
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Join Date: Nov 2004
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Junior Poster
yeah it was the semi colon, thx a bundle can i ask why it did that tho?
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Join Date: Aug 2005
Location: near St Louis, Missouri, USA
Posts: 10,697
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>> while(Pds >100);
that is an infinite loop because of the semicolon at the end. Your program will never stop executing that loop because the value os Pds never changes. This is a common error that everybody counters on occasion due to carelessness.
that is an infinite loop because of the semicolon at the end. Your program will never stop executing that loop because the value os Pds never changes. This is a common error that everybody counters on occasion due to carelessness.
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Join Date: Jun 2006
Location: India
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while ( Pds > 100 ) ; is equivalent to while ( Pds > 100 )
{
// sit back and enjoy baby
}Like Mr. Dragon said the variable which controls the run of your "While " loop never changes and so it goes on for infinity.
Last edited by ~s.o.s~ : Oct 9th, 2006 at 1:07 pm.
"I don't accept change. I don't deserve to live."
"Working a real job is a win if you're lazy, greedy, or unmotivated. If you're average, you fit right in. And if you're above average, the basic terms of employment and premise of the arrangement is against your interests."
"Working a real job is a win if you're lazy, greedy, or unmotivated. If you're average, you fit right in. And if you're above average, the basic terms of employment and premise of the arrangement is against your interests."
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