How can I make a calculator in C programming?

[JOYCE]

Hello,
I'm a new learner.I want to know how to make a calculator in C
programming.
I hope someone can help me .Thanks!

[Default User]

JOYCE wrote:

Hello,
I'm a new learner.I want to know how to make a calculator in C
programming.
I hope someone can help me .Thanks!

You haven't given us very much information. Thoroughly describe the
project as you envision it, and tell us what you have already tried.


Brian

[Nick Keighley]

On 3 Nov, 08:59, JOYCE <[e-mail]:

* * * *I'm a new learner.I want to know how to make a calculator in C
programming.
I hope someone can help me .Thanks!

It might be easier to start with what's called Reverse Polish
Notation (look it up).

Here expressions to be evaluated (calculated) are written
like this

2 2 + (calculates 2 + 2)
3 4 4 + * (calculates 3 * 4 + 4)

the rules are simple:
Read a symbol
if it's a number push it on a stack
if it's an operator remove the top two items from the stack
and apply the operator. Put the result on the stack
When you run out of symbols print what's on the stack

So you need a stack and a way to read symbols.

good luck!
--
Nick Keighley

[osmium]

"JOYCE" writes:

I'm a new learner.I want to know how to make a calculator in C
programming.

There is one in _The C Programming Language_ by Kernighan & Ritchie, fondly
called simply K&R. Any C programmer must eventually have that book so this
may be a good reason to get it now.

[Wolfgang Draxinger]

Nick Keighley wrote:

3 4 4 + * (calculates 3 * 4 + 4)

Actually this would calculate 3 * (4 + 4). This is how the stack
looks for every symbol read ('>' prefixes a read element, '='
prefixed a element resulting from a operation, replacing the
elements consumed by the operation; stack grows downwards):

>3

3

>4

3
4

>4

3
4
4

>+ -operator '+' performs addition on the

two topmost elements of the stack, yielding

3
=8

3
8

>* -operator '*' performs multiplication on the

two topmost elements of the stack, yielding

=24

Wolfgang Draxinger
--
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