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C++ Discussion Thread
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May 1st, 2004

Compare strings...

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Hi there,
Could some1 tell me whats wrong with this code...I know i shudnt b using an int variable but whats the right one for a string...

C++ Syntax (Toggle Plain Text)
  #include <iostream.h>
  void main()
  {
  int a,b;
  cout <<"Enter the first name";
  cin >>a;
  cout <<"Enter the 2nd no";
  cin >>b;
  ((a=="Tom") && (b=="Pam")) ? cout<<"Yesss..." : cout<<"Noo";
  }
  #include <iostream.h>
  void main()
  {
  int a,b;
  cout <<"Enter the first name";
  cin >>a;
  cout <<"Enter the 2nd no";
  cin >>b;
  ((a=="Tom") && (b=="Pam")) ? cout<<"Yesss..." : cout<<"Noo";
  }

Thanx a million

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wildrider30

Reputation Points: 11

Solved Threads: 0

Newbie Poster

Offline

4 posts
since Apr 2004

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May 1st, 2004

Re: Compare strings...

Hello,

No, int variables and character / string variables are different types. You want to do something like this:

C++ Syntax (Toggle Plain Text)
 
// Have to declare values and [size]
// Note that size must be large enough to handle the
// projected size of the word/sentance *and* the return character
// Overloads will overwrite other data in memory (BAD!)
// Compilers might handle overloads differently.
 
{
    char firstname[10], nextname[10];
 
    cout << "Enter the firstname: ";
    cin >> firstname;
 
}
// Have to declare values and [size]
// Note that size must be large enough to handle the
// projected size of the word/sentance *and* the return character
// Overloads will overwrite other data in memory (BAD!)
// Compilers might handle overloads differently.

{
    char firstname[10], nextname[10];

    cout << "Enter the firstname: ";
    cin >> firstname;

}

Now, you also wanted to compare if Firstname == Tom, and Nextname == Pam.

Couple things to remember:

Tom <> tom, Tom <> tOm <> TOm
Pam <> pam

Error checking, my friend!

In your studies, you may have heard of the string processing library. You should use one function to make all the data ALL CAPS or all smalls, and use another function to compare the strings. Here is a hint... strcmp

Good Luck,

Christian

kc0arf

Team Colleague

Reputation Points: 121

Solved Threads: 57

Posting Virtuoso

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1,629 posts
since Mar 2004

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May 2nd, 2004

Re: Compare strings...

there is a really helpful library called <algorithm> that can help you with string manipulation and comparing etc. look it up online or a book or something...
good luck

Bleek

Reputation Points: 45

Solved Threads: 0

Light Poster

Offline

28 posts
since Mar 2004

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May 6th, 2004

Re: Compare strings...

Use string.h

C++ Syntax (Toggle Plain Text)
strcmp(str1,str2);
strcmp(str1,str2);

returns 0 if they are equal

FireNet

Reputation Points: 108

Solved Threads: 7

Posting Whiz in Training

Offline

256 posts
since May 2004

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May 6th, 2004

Re: Compare strings...

Quote originally posted by FireNet ...

Use string.h
C++ Syntax (Toggle Plain Text)
strcmp(str1,str2);
strcmp(str1,str2);
returns 0 if they are equal

Note this will only work with c strings, if you want to use this function with string you will need to treat them as c style strings ie:

C++ Syntax (Toggle Plain Text)
if ((int a = strcmp(stringa.c_str(), stringb.c_str())) == 0) {
   cout << "Match" << endl;
} else {
   cout << "No match" << endl;
}
if ((int a = strcmp(stringa.c_str(), stringb.c_str())) == 0) {
   cout << "Match" << endl;
} else {
   cout << "No match" << endl;
}

With c++ I find it is easier to compare the strings with:

C++ Syntax (Toggle Plain Text)
if (stringa == stringb) {
   cout << "Match" << endl;
} else {
   cout << "No match" << endl;
}
if (stringa == stringb) {
   cout << "Match" << endl;
} else {
   cout << "No match" << endl;
}

HTH
Ben

liliafan

Reputation Points: 66

Solved Threads: 3

Junior Poster

Offline

117 posts
since Apr 2004

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May 30th, 2010

-1

Re: Compare strings...

#include<iostream>
#include<string>

using namespace std;

void main()
{

string s="hello";
string t="hello";

//std::string;

if(s==t)
cout<<"thek h"<<endl;
else
cout<<"e"<<endl;

}

billz91

Reputation Points: 9

Solved Threads: 0

Newbie Poster

Offline

1 posts
since Apr 2010

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Oct 23rd, 2010

Re: Compare strings...

You include <string.h> and then string a is used instead of int a , whatever

Stephen Ayodeji

Reputation Points: 10

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Newbie Poster

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3 posts
since Oct 2010

This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

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