Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

String compare

Posted on 2003-12-07
11
313 Views
Last Modified: 2010-04-01
String A =  "there is a UDP"
String B = "UDP"

How to find out whether string A contains "UDP"?
should i use string compare or anything?
should i str compare String A and B??
Could anyone advise

Thanks
0
Comment
Question by:OwenMania
11 Comments
 
LVL 22

Expert Comment

by:grg99
ID: 9892051
man strstr

0
 

Accepted Solution

by:
Drew_Benton earned 50 total points
ID: 9892110
grg99 is right what function but ill explain:

void TestFunction()
{
char* A = "there is a UDP";       // Your first orig string
char* B = "UDP";                      // Your second string you're looking for

char* result = strstr(A,B);         // strstr returns a pointer of char* of the first whole occurance

if(result)                // if the pointer actually has a location now ie: the WHOLE string was found
   ;                        // String was found, so do what ever you want now
else
   ;                        // String was not found, so dont do what was planned
}

- Drew
0
 
LVL 1

Expert Comment

by:igor_sk
ID: 9892499
All you guys said is correct in C.
But, if you use C++ (I suppose you do) and you use 'string' class to store your strings. Then you should use find() method of the class string:

string A =  "there is a UDP";
string B = "UDP";

if (A.find(B) != -1)
     cout << "String A contains string B" << endl;
else
     cout << "String B was not found in string A" << endl;
0
Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 

Expert Comment

by:Drew_Benton
ID: 9892812
hey ques: i was thinking the same thing as igor_sk siad, but it was part of a CString class (MFC), now this string class, umm honeslty, nvr heard of it b4 in C++, so what do i need to do to use it or is it a default type?
0
 

Author Comment

by:OwenMania
ID: 9894003
But how come i cannot declare String??
There's an error: Undeclared identifier "string"

i have already included string.h

#include <iostream>
#include <fstream.h>
#include <stdlib.h>
#include <STRING>

int main () {

String A;
return 0;
}
0
 

Expert Comment

by:Drew_Benton
ID: 9894065
try:
#include <STRING.H>
then that code
0
 

Expert Comment

by:Drew_Benton
ID: 9894068
then String/string
0
 

Author Comment

by:OwenMania
ID: 9894078
i have tried but failed
0
 

Author Comment

by:OwenMania
ID: 9894151
The method is:
  #include <string.h>
  using namespace std;

Done
0
 

Expert Comment

by:Drew_Benton
ID: 9894164
Ahh here we go, take a look at this:

http://www.bgsu.edu/departments/compsci/docs/string.html
0
 

Expert Comment

by:Drew_Benton
ID: 9894177
If that doesnt work, id recommend taking a look at my 1st post example of using the char*'s and try that to do what you want to do
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Unlike C#, C++ doesn't have native support for sealing classes (so they cannot be sub-classed). At the cost of a virtual base class pointer it is possible to implement a pseudo sealing mechanism The trick is to virtually inherit from a base class…
Templates For Beginners Or How To Encourage The Compiler To Work For You Introduction This tutorial is targeted at the reader who is, perhaps, familiar with the basics of C++ but would prefer a little slower introduction to the more ad…
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.

829 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question