integer in strcat()

[iantac]

I have a

int a=10;  //or let's say  int=9;
//and combine it to a ".txt" using strcat

strcat(a,".txt");

I already tried using

int a=10;
string h;

h=a;

strcat(h.c_str(),".txt");

But there's a error after compiling..
cannot convert parameter 1 from 'const char *' to 'char *'

I still need to retain integer 10, 9, 100 to '10', '9', '100' and not converting it to symbols and letters, etc..

what else can I do?

[coder777]

You can do this like so:

string h(1, char(10));
h += ".txt";

See:

http://www.cplusplus.com/reference/string/string/string/
http://www.cplusplus.com/reference/string/string/operator+=/

[iantac]

@coder
it just converts to the characters based at the ascii table..
10 is a new line so when I run it.. it shows

.txt

I need 10 -> '10' not 10 -> new line

[S G H]

Use _itoa to store your charized 10 into a temporary buffer, then add it to your string. Don't ever use stdio functions with C++ strings. Especially strcat. Buffer Overflow/Seg Fault may happen.

[coder777]

Okay, so I misinterpreted what you said.

Then use stringstream:

http://www.cplusplus.com/reference/iostream/stringstream/

You can do all kinds of formatting:

#include <sstream>

stringstream ss;

ss << 10 << ".txt";

string h = ss.str();