How to use itoa() in C++?

[Immortal Nephi]

I want to use itoa() function to convert from integer to string. I
looked at documenation. itoa() function is C sytle header like
string.h and stdlib.h. I am unable to find iostream library which itoa
() function should be built in string class like #include <string>,
but NOT #include <string.h> or #include <cstring>.

For example.

unsigned long i = 0x21ae;
string s1("integer is converted to string: ");

string s2 = itoa( i ); // ????

string s3 = s1 + s2;

cout << s3 << endl;


Output -- "integer is converted to string: 0x21ae".

 

[Victor Bazarov]

I want to use itoa() function to convert from integer to string. I
looked at documenation. itoa() function is C sytle header like
string.h and stdlib.h. I am unable to find iostream library which itoa
() function should be built in string class like #include <string>,
but NOT #include <string.h> or #include <cstring>.

There is no 'itoa' function in standard C or C++.

For example.

unsigned long i = 0x21ae;
string s1("integer is converted to string: ");

string s2 = itoa( i ); // ????

string s3 = s1 + s2;

cout << s3 << endl;


Output -- "integer is converted to string: 0x21ae".

Use 'std:stringstream'.

V

 

[Immortal Nephi]

There is no 'itoa' function in standard C or C++.







Use 'std:stringstream'.

V,

I can't find 'std:stringstream' example code in the iostream
library. Can you be kind to give me your example code, please? Thank
you.

 

[Thomas J. Gritzan]

V,

I can't find 'std:stringstream' example code in the iostream
library. Can you be kind to give me your example code, please? Thank
you.

http://www.parashift.com/c++-faq-lite/misc-technical-issues.html#faq-39.1

 

[Jorgen Grahn]

There is no 'itoa' function in standard C or C++.

IIRC, it was a common C extension in the distant past.

But I am pretty sure it never rendered the integer in hexadecimal.

Use 'std:stringstream'.

Or sprintf(), wrapped in a function which he can call itoa() if he
wants. No risk of buffer overflow in this case.

/Jorgen