What is the equivalent of ToString("00") in C++?

Question

What is the equivalent of .ToString("00") in C++?

I'm getting an error stating that

left of '.ToString' must have class/struct/union
1>        type is 'double'

Update: Thanks for the replies, i'm having another similar issue now //inorder to get //.ToString("00.00000") i did the following

  memset(buf, 0, sizeof(buf));
  sprintf_s(buf, "%02.7f",latm); //.7 to match heremisphere
  std::string latm_str = buf;

i realised that the %02 doesnt have any effects, example when i get a 7.0, the result is 7.0000000 rather than the desired 07.0000000, anything wrong here?

"What is English for 'Je suis un rock star'?" is a pretty useless question unless you know that the original phrase is in French :-) What source language is your original in? — paxdiablo, Oct 16 '14 at 08:23
What language is `ToString("00");` in? Also `"00"` already looks like a string. — Galik, Oct 16 '14 at 08:24
I thinks its C# and you use it like this: `double a = 3.14; string s = a.ToString("00"); // will be 03` — Tomashu, Oct 16 '14 at 08:30
From the error and its text, I'd guess you are doing `someDouble.ToString( "00" )`. I don't know where you got this from, but it certainly isn't C++. In C++, conversions to text are done using `std::ostringstream` (sometimes wrapped in function). — James Kanze, Oct 16 '14 at 08:31

score 3 · Answer 1 · edited Oct 16 '14 at 08:25

3

I think you should use std::to_string

edited Oct 16 '14 at 08:25

RJFalconer

10,890
5
51
66

answered Oct 16 '14 at 08:21

Etixpp

320
2
11

score 1 · Answer 2 · edited May 23 '17 at 11:57

1

I'm guessing that this is C# based on this link. If so depending on whether you have access to C++11, you can probably use the following:

int a = 3;
std::string s = std::to_string(a);

If you're not yet using C++11 then you can use the following:

int a = 3;
std::ostringstream ss;
ss.fill('0');
ss << std::setw(2) << a;
std::string s = ss.str();

More detail is on this question

edited May 23 '17 at 11:57

Community

1
1

answered Oct 16 '14 at 08:32

Component 10

10,247
7
47
64

score 1 · Accepted Answer · edited May 23 '17 at 11:57

1

double number = 3.14;
char buf[100];
sprintf_s(buf, "%02d", (int)number);
string s = buf;
cout << s; // prints 03

Based on Custom string formatting: ToString("00")

edited May 23 '17 at 11:57

Community

1
1

answered Oct 16 '14 at 08:35

Tomashu

515
1
11
20

thanks for your reply, just wondering what if its .ToString("00.00000") ? Do i just need to do a sprintf_s(buf, "%2.5f", number); – user1157977 Oct 16 '14 at 08:50

score 0 · Answer 4 · answered Oct 16 '14 at 08:26

0

it's std::to_string in C++, what you are looking for.

double abc = 23.233;
std::string mystring = std::to_string(abc);

answered Oct 16 '14 at 08:26

Zeeshan

2,884
3
28
47

What is the equivalent of ToString("00") in C++?

4 Answers4