Help for the Unix Task.This is simple but i need help...Please help me....

[SijSaru13]

Dear everybody,

I have to write a program that implements a real-time multicast calculator service. Users join a multicast group and are able to send equations to other clients for calculation - no separate server is needed. Calculations are sent in a single string to the multicast group and the result is returned once it has been calculated by a client in single string containing the equation and its result. The client must be able to calculate simple addition, subtraction, multiplication and division calculations. The required maximum amount of factors in an equation is 5. Clients are not required to implement removal of duplicate results.

For example if the client send a equation 2+3*2 then the server should return the result 8.
Thankyou in advance,

[srikpen]

in perl you can do some thing like

@numTokens = split/\+\*\/\-/, $calcString

$numTokens[0] will contain you first operand and so on..

so basically look into regex and you can retrieve you operators as well as your
operands.

[SijSaru13]

in perl you can do some thing like

@numTokens = split/\+\*\/\-/, $calcString

$numTokens[0] will contain you first operand and so on..

so basically look into regex and you can retrieve you operators as well as your
operands.

Thanx for your suggestion ,but i have to do it in C .Please help me if you can.
Thanx..

[steven]

Thanx for your suggestion ,but i have to do it in C .Please help me if you can.
Thanx..

Why don't you start by showing people what have already come up with yourself. Surely you've made a start, right? I'm sure you're not the kind of person who comes to a forum expecting other people to give you the code... =]

[ValHolla]

if you are looking to do this in C. check out the man page for strtok

char *strtok(char *s1, const char *s2);

char *strtok_r(char *s1, const char *s2, char **lasts);
strtok()
The strtok() function can be used to break the string
pointed to by s1 into a sequence of tokens, each of which is
delimited by one or more characters from the string pointed
to by s2. The strtok() function considers the string s1 to
consist of a sequence of zero or more text tokens separated
by spans of one or more characters from the separator string
s2. The first call (with pointer s1 specified) returns a
pointer to the first character of the first token, and will
have written a null character into s1 immediately following
the returned token. The function keeps track of its position
in the string between separate calls, so that subsequent
calls (which must be made with the first argument being a
null pointer) will work through the string s1 immediately
following that token. In this way subsequent calls will work
through the string s1 until no tokens remain. The separator
string s2 may be different from call to call. When no token
remains in s1, a null pointer is returned.

strtok_r()
The strtok_r() function has the same functionality as
strtok() except that a pointer to a string placeholder lasts
must be supplied by the caller. The lasts pointer is to
keep track of the next substring in which to search for the
next token.