getting an error ???

I take it you didn't change the printf to use %f - that looks like a floating point number printed with %d.

The reason the language has while and do-while and a few other constructs is exactly to avoid having goto's. They do the same thing in a more easy to read fashion.

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Mats

...................

Yes, if you enter f (or any other non-float-number stuff) as part of your input, then it will get stuck - like I said, scanf() can be very temperamental, and will quite easily get confused by "bad input".

If it is a requirement to actually be able to tolerate user errors, then fgets() is the right way to go.

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Mats

Ok , well ill get some sleep now, and ask my tutor about using fgets , thanks a lot for your help :)

Turns out the user must enter the f value , and the program must process the whole thing . I think the way I will handle this is to use string compare. I think my tutor would prefer that to fgets. When I askd him this is the reply I rceeived :
> Am I allowed to use a more advanced way if it simplifies the
> procedure ?
No. Look at style ( that he teaches in lectures and practicals ) NOT the code you use.

What do you think is easier and more logical way for a beginner to use for my problem , to convert the input to a string use string compare to compare the apertures with valid values , or to use fgets ? We haven't been taught neither of the ways . Any suggestions ?

well, I'm thinking since the string you get for aperture is *always* in the form: f1.2 f1.4, etc, you have an f followed by a number. Thinking further, if you had a char array and the you wanted to convert that to a number via stroll(), you can't do it because the first char is not a number. So you could advance the array by one and then use stroll()...

QuantumPete

Maybe there's a way to simply ignore the input of the first character , and store the rest in a string ?

There is a dead simple way; but why store the rest in a *string*, if you can ignore the first character and read the rest as a *float*???

QuantumPete

Quote:

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Originally Posted by QuantumPete

There is a dead simple way; but why store the rest in a *string*, if you can ignore the first character and read the rest as a *float*???

QuantumPete

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If I can store it as a float it's even better . How would I do that ?

I'll give you an example and then you can work it out from there, I'm sure ;)

Code:

---

float amount = 0.0f;
printf  ("Enter the price like so: £100.23\n");
scanf ("£%f", &amount);
printf ("You entered £%f\n", amount);

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You could also use fgets to get the input as a string and then do something very similar with sscanf to get the float, like matsp said. I reccomend you go to your department library and get "The C Programming Language" by Kernighan and Ritchie (Second Edition). All this stuff is explained in there and will help you to fix simple problems by yourself :)

QuantumPete

Mmm, 85 replies and we seem to be going round in circles. The question shouldn't be this hard.
@ki113r, I would suggest you start a new thread, with your latest code and whatever specific questions you still have outstanding.

Quote:

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Originally Posted by QuantumPete

I'll give you an example and then you can work it out from there, I'm sure ;)

Code:

---

float amount = 0.0f;
printf  ("Enter the price like so: £100.23\n");
scanf ("£%f", &amount);
printf ("You entered £%f\n", amount);

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You could also use fgets to get the input as a string and then do something very similar with sscanf to get the float, like matsp said. I reccomend you go to your department library and get "The C Programming Language" by Kernighan and Ritchie (Second Edition). All this stuff is explained in there and will help you to fix simple problems by yourself :)

QuantumPete

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Simple and effective I like it :) I am pretty sure there won't be more questions, the rest seems quite starightforward :)

You should also be seeing your tutor or whoever for help, while is place is great it shouldn't be your sole source of information.

How would I limit the printf ouput to only 1 decimal when it prints out the float? I tried searching the FAQ to no avail

Quote:

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Originally Posted by ki113r

How would I limit the printf ouput to only 1 decimal when it prints out the float? I tried searching the FAQ to no avail

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"The C Programming Language" by Kernighan and Ritchie (Second Edition) page 153/154 ;)

QuantumPete