dev-cpp-users

RE: [Dev-C++] I am new to C ++ and need some help

[Bruce Y. <y2...@ho...>]

<html><DIV>
<P>be sure to include the:&nbsp;&nbsp; #include &lt;string&gt;</P>
<P><BR>#include &lt;iostream.h&gt;<BR>#include &lt;stdlib.h&gt;<BR>#include &lt;string&gt;</P>
<P>int main()<BR>{<BR>&nbsp;&nbsp;&nbsp; string name;</P>
<P>&nbsp; do<BR>&nbsp; {&nbsp;&nbsp; cout &lt;&lt; "\nPlease enter your name: ";<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cin &gt;&gt; name;</P>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cout &lt;&lt; "\nName = " &lt;&lt; name &lt;&lt; endl;</P>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (name == "John" || name == "john")<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cout &lt;&lt; "\nThank you!!\n";<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; else<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cout &lt;&lt; "\nNo. Try again";</P>
<P>&nbsp; }<BR>&nbsp;&nbsp; while(name != "John" || name != "john");</P>
<P>&nbsp;</P>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; system("PAUSE");<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return 0;<BR>}</P></DIV><br clear=all><hr>Get more from the Web.  FREE MSN Explorer download : <a href="http://explorer.msn.com">http://explorer.msn.com</a><br></p></html>

RE: [Dev-C++] I am new to C ++ and need some help

[<pra...@ya...>]

hey u used the wrong logic!
you cannot use the statement 
if(char c=='bruce')
{cout<<"Thankk You";
you will have to use the following commands:-

#include<string>
char c[25];
cout<<"enter your name";
if(strcmp(c,"bruce")==0)
cout<<"Thank You";
else 
cout<<"You are not granted access";
exit(0);
}

--- Bruce Young <y2...@ho...> wrote: 
<HR>
<html><DIV>
<P>be sure to include the:&nbsp;&nbsp; #include
&lt;string&gt;</P>
<P><BR>#include &lt;iostream.h&gt;<BR>#include
&lt;stdlib.h&gt;<BR>#include &lt;string&gt;</P>
<P>int main()<BR>{<BR>&nbsp;&nbsp;&nbsp; string
name;</P>
<P>&nbsp; do<BR>&nbsp; {&nbsp;&nbsp; cout &lt;&lt;
"\nPlease enter your name:
";<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cin &gt;&gt;
name;</P>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cout &lt;&lt;
"\nName = " &lt;&lt; name &lt;&lt; endl;</P>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (name == "John"
|| name ==
"john")<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
cout &lt;&lt; "\nThank
you!!\n";<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
else<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
cout &lt;&lt; "\nNo. Try again";</P>
<P>&nbsp; }<BR>&nbsp;&nbsp; while(name != "John" ||
name != "john");</P>
<P>&nbsp;</P>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
system("PAUSE");<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return 0;<BR>}</P></DIV><br clear=all><hr>Get more
from the Web.  FREE MSN Explorer download : <a
href="http://explorer.msn.com">http://explorer.msn.com</a><br></p></html>
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RE: [Dev-C++] I am new to C ++ and need some help

[Ioannis V. <no...@ya...>]

> -----Original Message-----
> From: dev...@li...
> [mailto:dev...@li...]On Behalf Of
> prakyath pai
> Sent: Monday, December 11, 2000 11:47 AM
> To: dev...@li...
> Subject: RE: [Dev-C++] I am new to C ++ and need some help
>
>
> hey u used the wrong logic!
> you cannot use the statement
> if(char c=='bruce')
> {cout<<"Thankk You";
> you will have to use the following commands:-
>
> #include<string>
> char c[25];
> cout<<"enter your name";
> if(strcmp(c,"bruce")==0)
> cout<<"Thank You";
> else
> cout<<"You are not granted access";
> exit(0);
> }

In fact the following stuff can be used in C++ only.

 char s1[20], s2[20];
...

if(s1==s2)
...

The overloaded string operator == accepts 2 strings (objects) and the
C-style strings are "upgraded" to temporary strings so as the comparison to
work.

But the better is string s1, s2; to be used instead (including the
<string>).


Ioannis


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RE: [Dev-C++] I am new to C ++ and need some help

[Nick <en...@ho...>]

Hello, 
 
> In fact the following stuff can be used in C++ only.
> 
>  char s1[20], s2[20];
> ...
> 
> if(s1==s2)
> ...
> 
> The overloaded string operator == accepts 2 strings (objects) and the
> C-style strings are "upgraded" to temporary strings so as the
> comparison to work.

You can use == as long as one of the arguments is a (C++) string 
object. In your example above, it does not use the string operator.

#include <iostream>
#include <cstring>
#include <string>
using namespace std;

int main(){
    char temp1[20], temp2[20];
    string temp3;
    strcpy(temp1,"John");
    strcpy(temp2,"John");
    temp3 = "John";
    if (temp1 == temp2) cout << "temp1 == temp2" << endl;
    else cout << "temp1 != temp2" << endl;
    if (temp3 == temp1) cout << "temp3 == temp1" << endl;
    else cout << "temp3 != temp1" << endl;
    if (temp2 == temp3) cout << "temp2 == temp3" << endl;
    else cout << "temp2 != temp3" << endl;

    system("pause");
    return(0);
}
 
> But the better is string s1, s2; to be used instead (including the
> <string>).

Agreed.

--
regards,

Nick

RE: [Dev-C++] I am new to C ++ and need some help

[Ioannis V. <no...@ya...>]

> -----Original Message-----
> From: dev...@li...
> [mailto:dev...@li...]On Behalf Of Nick
> Sent: Tuesday, December 12, 2000 9:48 AM
> To: dev...@li...
> Subject: RE: [Dev-C++] I am new to C ++ and need some help
> 
> 
> 
> Hello, 
>  
> > In fact the following stuff can be used in C++ only.
> > 
> >  char s1[20], s2[20];
> > ...
> > 
> > if(s1==s2)
> > ...
> > 
> > The overloaded string operator == accepts 2 strings (objects) and the
> > C-style strings are "upgraded" to temporary strings so as the
> > comparison to work.
> 
> You can use == as long as one of the arguments is a (C++) string 
> object. In your example above, it does not use the string operator.

Oops, you are absolutely right, it is pointer comparison.


Ioannis

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RE: [Dev-C++] I am new to C ++ and need some help

[Chad S. <ho...@ho...>]

>From: prakyath pai <pra...@ya...>
>Reply-To: dev...@li...
>To: dev...@li...
>Subject: RE: [Dev-C++] I am new to C ++ and need some help
>Date: Mon, 11 Dec 2000 01:47:06 -0800 (PST)
>
>hey u used the wrong logic!
>you cannot use the statement
>if(char c=='bruce')
>{cout<<"Thankk You";
>you will have to use the following commands:-
>
>#include<string>
>char c[25];
>cout<<"enter your name";
>if(strcmp(c,"bruce")==0)
>cout<<"Thank You";
>else
>cout<<"You are not granted access";
>exit(0);
>}

If you bothered to look at the post, you'd see that he didn't use a char in 
the comparison. Nor did he use a C style string (char *). He instead used a 
C++ string class, which does support the == operator to another string for 
evaluation.

So to finally kill this thread...

If you are programming in C you'd use:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main()
{
   char Name[5];

   puts("What is your name??");

   fgets(Name, 5, stdin);

   if(!strcmp(Name, "John") || !strcmp(Name, "john")
      || !strcmp(Name, "JOHN"))
   {
      puts("Hello John.");
   }
   else
      puts("Your name isn't John, go away.");

   return 0;
}


If you are using C++ use:

int main()
{
   string Name;

   cout << "What is your name??" << endl;

   cin >> Name;

   if((Name == "John") || (Name == "JOHN") || (Name == "john"))
   {
      cout << "Hello John" << endl;
   }
   else
      cout << "Your name isn't John, go away. << endl;

   return 0;
}


Chad Simmons
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RE: [Dev-C++] I am new to C ++ and need some help

[Chad S. <ho...@ho...>]

>From: "Chad Simmons" <ho...@ho...>
>Reply-To: dev...@li...
>To: dev...@li...
>Subject: RE: [Dev-C++] I am new to C ++ and need some help
>Date: Mon, 11 Dec 2000 08:37:06 -0800


>   else
>      cout << "Your name isn't John, go away. << endl;

The above should read

   else
      cout << "Your name isn't John, go away." << endl;

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