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analysing strings

Posted on 2002-07-23
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Last Modified: 2010-04-01
I have a string[240] and I want to search this string for several different words.  The words could be in any part of the string.
is there a function that will search the string for the specified word or do i need to create one?
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Question by:Karls
7 Comments
 
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Expert Comment

by:Serega
ID: 7171225
strstr can help you, I think...

strstr - Find a substring

char *strstr( const char *string, const char *strCharSet );

returns a pointer to the first occurrence of strCharSet in string, or NULL if strCharSet does not appear in string.
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Expert Comment

by:ozo
ID: 7171228
#include <string.h>
char *strstr (const char *s1, const char *s2);
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Expert Comment

by:himmya
ID: 7171657
hi,

 u can use find member from basic strings....

  string str("ur string over here");

  if(str.find("ur world")>=0)
       found the word in string

u can use the no of find just go through the documentation of find() overloaded versions...

i think this will help u ......

rgds,
himmya.
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Expert Comment

by:Sabnis
ID: 7171714
if you want the C-Style search then use the function above to locate the strings....within a for loop....or use a C++ style STL string class and use its member function find...again within a for loop
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Expert Comment

by:Axter
ID: 7172748
Hi (himmya ), welcome to EE.

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There are many experts who never post answers as answer.  Instead, they post their answers as comments.

If you read the following link, you'll see why this is the preferred method for many of our valued experts, including myself.

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Hi (Karls):
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Accepted Solution

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Axter earned 50 total points
ID: 7172768
The following is example code using STL method

#include <string>
#include <iostream>


int main()
{
     std::string Source = "This is a test to see if this works";

     for(size_t i = Source.find("is");
               i != std::string::npos;
               i = Source.find("is", i+1))
     {
          std::cout << "Found key word at position " << i << std::endl;
     }
     
    return 1;
}

You should compare the return of string::find with std::string::npos in order to determind if the string was found.
A value of std::string::npos, means the string was not found.

To futher iterate through the string, pass a second argument to the string::find function, which tells the function the starting point for the new search.
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Author Comment

by:Karls
ID: 7176225
Thats what I was looking for.
You don't actually need to do it in a for loop though.  will do the entire line.
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