How to convert int/long/float/double numeric types and strings into each other in Candlestick +

In order to solve this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible method.

Long long_data=-9828

Unsigned char data [4]

Memcpy (data,&t,4); / / save data of type long with 4 char.

Long my_long_data=0

Memcpy (& tt,data,4); / / restore long type data from 4 char.

1. Convert int/long/float/double to string

Method 1:itoa, ltoa (a represents the meaning of array array)

Header file: stdlib.h

Example:

Int a = 3

Long b = 23

Char buf1 [30] = ""

Itoa (a, buf1, 10); / / 10 means decimal, and the content saved by buf1 is "3"

Char buf2 [30] = ""

Ltoa (b, buf2, 10); / / 10 means decimal, and the content saved by buf2 is "32"

Method 2:sprintf

Header file: stdio.h

Example:

Int a = 3

Float b = 4.2f

Char buf [30] = ""

Sprintf (buf, "% djue% f", a, b); / / the content saved by buf is "3djue 4.2", which can be compared with printf

Method 3:ostringstream

Header file: # include

Using namespace std

Example:

Int a = 3

Float b = 4.2f

Ostringstream s1

S1