DrawText's first argument needs to be a const(char)* but i tried using to! for that and have failed :(
yVel = to!(string)(player.vel.y);
DrawText(yVel, player.pos.x, player.pos.y - 40, 20, RAYWHITE);
How to properly convert from float to const(char)* ?
to!string converts from float to string. Then toStringz converts from string over to a const char*. So just combine them.
Or for more control and efficiency, you could define a little stack buffer and sprintf or something as well.
Generally some_string.ptr will give something you can use as const char*, just make sure you put the 0 terminator at the end before passing it to most C or Windows functions.
Related
what is the simplest way to print the result as follows using pyhton3
I have a Hex string s="FFFC"
In python if using this command line: print(int(s,16))
The result I'm expecting is -4 (which is in signed format). But this is not the case, It displays the Unsigned format which the result is 65,532.
How can I convert this the easiest way?
Thank you in advance.
There are several ways, but you could just do the math explicitly (assuming s has no more than 4 characters, otherwise use s[-4:]):
i = int(s, 16)
if i >= 0x8000:
i -= 0x10000
You can use the bytes.fromhex and int.from_bytes class methods.
s = bytes.fromhex('FFFC')
i = int.from_bytes(s, 'big', signed=True)
print(i)
Pretty self-explanatory, the only thing that might need clarification is the 'big' argument, but that just means that the byte array s has the most significant byte first.
That may sound like a weird struggle and actually easy to do, but I cannot find a working way to convert an hexidecimal in a string format into a float.
My exemple is for instance: 406ea716
If I convert it using one of the following website, I get 3.728948.
http://www.h-schmidt.net/FloatConverter/IEEE754.html
http://gregstoll.dyndns.org/~gregstoll/floattohex/
I tried every single piece of code I found on the internet, but it won't return the same result.
Does it exist a module in NodeJS to perform the same conversion? If not, what can I do?
Thank you for your help.
I had the same issue. try this.
Buffer('406ea716','hex').readFloatBE(0)
3.7289481163024902
No need for a module:
var hex = '406ea716';
// transform the hexadecimal representation in a proper js hexadecimal representation by prepending `0x` to the string
// parseInt() - because your example was an integer.
var num = parseInt( '0x' + '406ea716');
console.log( num );
Have you tried parseInt?
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt
$ node
> parseInt('406ea716', 16)
1080993558
I have a managed array:
array<unsigned char>^ myGcArray;
Assume the array is null terminated. I want to display the contents using Console::WriteLine(). What's the easiest way to convert myGcArray to String ?
One of the constructors to String has a parameter of const char*, so if I can convert myGcArray to that, then it would work too. How should I do that?
I can copy the contents of myGcArray to a regular unsigned char myarray[], but is that the best way?
Thank you.
You have to use the proper encoding. If you have no idea then get started with
String^ str = System::Text::Encoding::Default->GetString(myGcArray);
by Hans Passant
Code snippet:
Serial.println(sensorString); //so you can see the captured string
char carray[sensorString.length() + 1]; //determine size of the array
Serial.println(sizeof(carray));
sensorString.toCharArray(carray, sizeof(carray)); //put sensorString into an array
float sensorStringFloat = atoi(carray); //convert the array into an Integer
Serial.println(sensorStringFloat);
Serial.println(sensorStringFloat) prints out 5.00 instead of the correct float value of 5.33. Why is that and how do I fix this issue? I would eventually like to pass sensorStringFloat over to:
aJson.addNumberToObject(sensor, "ph", sensorStringFloat);
atoi converts a numeral in ASCII to an integer. The comment on that line also says it converts to an integer. So you got an integer result, 5. To convert to floating-point, consider using atof. (Note that “f” stands for floating-point, not “float”. atof returns a double.)
you should pass another parameter which defines the format, in this case it is the number of digits after the floating point.
Serial.println(sensorString,2);
String temp = String (_float, 0);
say float x;
convert to String using
String _temp = String(x, 0);
The second parameter 0... says i want no trailing zeros.
Caution: However this is only suitable for whole numbers.
This solution would not work for say... 1.24
You'll get just 1.
I am trying to learn assembler and want to write a function to convert a number to a string. The signature of the function I want to write would looks like this in a C-like fashion:
int numToStr(long int num, unsigned int bufLen, char* buf)
The function should return the number of bytes that were used if conversion was successful, and 0 otherwise.
My current approach is a simple algorithm. In all cases, if the buffer is full, return 0.
Check if the number is negative. If it is, write a - char into buf[0] and increment the current place in the buffer
Repeatedly divide by 10 and store the remainders in the buffer, until the division yields 0.
Reverse the number in the buffer.
Is this the best way to do this conversion?
This is pretty much how every single implementation of itoa that I've seen works.
One thing that you don't mention but do want to take care of is bounds checking (i.e. making sure you don't write past bufLen).
With regards to the sign: once you've written the -, you need to negate the value. Also, the - needs to be excluded from the final reversal; an alternative is to remember the sign at the start but only write it at the end (just before the reversal).
One final corner case is to make sure that zero gets written out correctly, i.e. as 0 and not as an empty string.