Re: How to convert string 2 int...

Re: How to convert string 2 int...

[Keith Arthurs]

In article <CwqqL5.CEv@umassd.edu>,
 on Mon, 26 Sep 1994 14:22:17 GMT,
 Paul Baptista <bub@cis.umassd.edu> writes:
>I'm starting to learn ADA.  I know with other languages we can convert
>a character variable to an integer.  I was wonder can ADA do this?
>
[snip]
>
>Pauloo
>
>bub@cis.umassd.edu


  You could use the 'Value attribute for converting String to Integer.  Look
up 'Value in section 3.5.5 in the LRM.


Keith Arthurs
McDonnell Douglas Corporation
Disclaimer: De vus her ur net deup en yuns uv mhik denhuld uhglus

How to convert string 2 int...

[Paul Baptista]

I'm starting to learn ADA.  I know with other languages we can convert
a character variable to an integer.  I was wonder can ADA do this?

I'm trying to write a program that accepts a string from the user.
Then it will parse out all the numbers in the string and print the total.

Ex.   Enter string: 1x2x3x4x5x6x7x8x9x10

Result: 

1
2
3
4
5
6
7
8
9
10
---
55

Can anyone help me?

TIA!!

Pauloo

bub@cis.umassd.edu

Re: How to convert string 2 int...

[R. William Beckwith]

Paul Baptista (bub@cis.umassd.edu) wrote:
: I'm starting to learn ADA.  I know with other languages we can convert
: a character variable to an integer.  I was wonder can ADA do this?

: I'm trying to write a program that accepts a string from the user.
: Then it will parse out all the numbers in the string and print the total.

snip

: Can anyone help me?

Is this a homework assignment?

... Bill

-- 
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Re: How to convert string 2 int...

[Gentle]

Paul Baptista (bub@cis.umassd.edu) wrote:
: I'm starting to learn ADA.  I know with other languages we can convert
: a character variable to an integer.  I was wonder can ADA do this?
: I'm trying to write a program that accepts a string from the user.
: Then it will parse out all the numbers in the string and print the total.

: bub@cis.umassd.edu

  That's easy!  There's an Ada call in TEXT_IO for integers (referencing
the generic package INTEGER_IO):
  GET (FROM : in STRING; ITEM: out NUM; LAST : out POSITIVE);

Try this:

with TEXT_IO;
use  TEXT_IO;

procedure BLAH is
  subtype MYNUM is INTEGER range 0 .. 1000;
  package MYNUM_IO is new INTEGER_IO (MYNUM);

  subtype LINE_RANGE is INTEGER range 1 .. 80;

  USER_INPUT : STRING (LINE_RANGE);
  USER_NUM   : MYNUM := 0;

  NULL_INPUT : exception;

  LLAST      : INTEGER;  -- MUST be integer for GET_LINE call.
  STRIX      : INTEGER;  -- MUST be same type as LLAST
begin
  -- Get input from user
  GET_LINE (USER_INPUT, LLAST);

  -- Check for input error
  if LLAST = 0 then
    raise NULL_INPUT;
  end if;

  -- Initialize string index for parsing
  STRIX := LINE_RANGE'FIRST;
  while STRIX <= LINE_RANGE'LAST loop
    MYNUM_IO.GET (
      FROM => USER_INPUT (STRIX .. LINE_RANGE'LAST),
      ITEM => USER_NUM,
      LAST => LLAST);

    -- LLAST is returned such that USER_INPUT(LLAST) was the last
    -- character read from the string.

    MYNUM_IO.PUT (USER_NUM);
    NEW_LINE;

    -- Now update the string index
    STRIX := STRIX + LLAST + 1;
  end loop;

exception
  when NULL_INPUT =>
    PUT_LINE ("No input - terminating.");
end BLAH;


  Hope this helps!!

--
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Re: How to convert string 2 int...

[John J Cupak Jr CCP]

Paul,

	Given the simplicity of this problem, I assume that this is a programming assignment. I suspect that the instructor wants you to parse
an input line an break it into tokens, displaying the numeric ones.

	Well, I won't tell you how to do all of it, but take a look at
the data conversion attributes in LRM Appendix A.

	Hope this helps!
--
John J. Cupak, Jr., CCP       Lockheed DECNet: NHQVAX::CUPAK
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