C++ multi strings in char

Question

i have problem with multi strings in 1 char

//------------------------------------------------
char* P1P2P3 = { FirstName,LastName,Email };
    if (strcmp(buffer5, P1P2P3) == 0)
          {
           //OK
          }
    else
          {
           //Not OK
          }
//----------------------------------------------

this is my problem :

error C2440: 'initializing' : cannot convert from 'initializer-list' to 'char *'

i want it come like this

First Name+Last Name+Email

for ex :

First name : Max

Last name : TEST

Email : Max@gmail.com

it should come like this : MaxTESTMax@Gmail.com

Thanks guys

Welcome to stackoverflow. I'm afraid your question needs some more information to be able to receive answers: what exactly are FirstName, LastName and Email? Are they char* variables? If so, would you like to concatenate them? In that case [this question](http://stackoverflow.com/questions/1995053/const-char-concatenation) might help you. But either way, try to provide a little more context. Good luck. — qqbenq, Sep 03 '15 at 09:09

stefaanv · Answer 1 · 2015-09-03T14:17:19.007

0

The only valid initialization for C-style strings is:

const char* const P1P2P3 = "literal string";

All other ways of making such strings can't be done by initializing.

A C-style strings way in C++ would be

char* P1P2P3 = new char[ENOUGH];
sprintf(P1P2P3, "%s%s%s", FirstName, LastName, Email);
//...
delete[] P1P2P3;

With C++ strings:

std::string P1P2P3 = std::string(FirstName) + LastName + Email;
if (buffer5 == P1P2P3) //...

edited Sep 03 '15 at 14:17

answered Sep 03 '15 at 09:11

stefaanv

14,072
2
31
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_"The only valid initialization for C-style strings is:"_ What about `const char* const P1P2P3 = FirstName LastName Email;`? – πάντα ῥεῖ Sep 03 '15 at 09:26
@molbdnilo I supposed that, unfortunately OP doesn't tell what these are. – πάντα ῥεῖ Sep 03 '15 at 09:31
Which version of C has `new` and `delete` ? – Shreevardhan Sep 03 '15 at 10:16
@Shreevardhan: I reworded a bit. – stefaanv Sep 03 '15 at 14:17

score 0 · Answer 2 · answered Sep 03 '15 at 09:12

option 1: use std::string instead of char*

std::string FirstName,LastName,Email;
 ...
std::string P1P2P3 = FirstName+LastName+Email;

option 2: use std::stringstream

std::stringstream sout;
sout<<FirstName<<LastName<<Email;
char* P1P2P3 = sout.str().c_str();

option 3: use sprintf to print string into buffer

option 4: use strcat to append 2 string, then again to append the 3rd.

score 0 · Answer 3 · answered Sep 03 '15 at 10:15

0

Why not go with C++ way of doing it.

std::string P1P2P3 = FirstName + LastName + Email;
if (P1P2P3 == buffer5) {
    // OK
}
else {
    // Not OK
}

answered Sep 03 '15 at 10:15

Shreevardhan

12,233
3
36
50

C++ multi strings in char

3 Answers3