How to convert char ASCII to int
For example;
I want to get Int dd = 0 from ASCII byte bb = 48;
I want to get Int dd = 0 from ASCII byte bb = 48;
If you look at the ascii values for the numbers 0-9, you will find that they are all in order, starting at 48. So, convert the byte to int, then subtract 48.
ASKER
Maybe I didn't explain clearly, I repeat the question in another way:
I read a char, for example '0', from a file and store char as byte 48 in a byte array, then I need to convert 48 to int 0 for calculate.
I don't want to do as int dd = bb-48; I think C# should have some function to do it.
I read a char, for example '0', from a file and store char as byte 48 in a byte array, then I need to convert 48 to int 0 for calculate.
I don't want to do as int dd = bb-48; I think C# should have some function to do it.
Ah, I see what you mean now. I'm not terribly fond of this (because of the conversion by ToString), but you *can* do:
int dd = Convert.ToInt32(bb.ToString());ASKER CERTIFIED SOLUTION
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ASKER
Thank kaufmed.
NP. Glad to help = )
"I don't want to do as int dd = bb-48; I think C# should have some function to do it."
From my point of view - this would be the best solution. It it fast and precise. This is a clever low-level approach.
Using string functions and parse - a bit too long way. Still - it works. If you don't like the first approach.
The last method that kaufmed suggested - is a VERY strange one. I have no idea how it works!
Why it returns 0.25 for a '%' character, e.g.?!
Do like in my code, or read:
http://stackoverflow.com/questions/2866738/whats-the-deal-with-char-getnumericvalue
My output:
0 U+0030 48; d=0
1 U+0031 49; d=1
2 U+0032 50; d=2
3 U+0033 51; d=3
4 U+0034 52; d=4
5 U+0035 53; d=5
6 U+0036 54; d=6
7 U+0037 55; d=7
8 U+0038 56; d=8
9 U+0039 57; d=9
? U+00b2 178; d=2
? U+00b3 179; d=3
? U+00b9 185; d=1
? U+00bc 188; d=0.25
? U+00bd 189; d=0.5
? U+00be 190; d=0.75
From my point of view - this would be the best solution. It it fast and precise. This is a clever low-level approach.
Using string functions and parse - a bit too long way. Still - it works. If you don't like the first approach.
The last method that kaufmed suggested - is a VERY strange one. I have no idea how it works!
Why it returns 0.25 for a '%' character, e.g.?!
Do like in my code, or read:
http://stackoverflow.com/questions/2866738/whats-the-deal-with-char-getnumericvalue
My output:
0 U+0030 48; d=0
1 U+0031 49; d=1
2 U+0032 50; d=2
3 U+0033 51; d=3
4 U+0034 52; d=4
5 U+0035 53; d=5
6 U+0036 54; d=6
7 U+0037 55; d=7
8 U+0038 56; d=8
9 U+0039 57; d=9
? U+00b2 178; d=2
? U+00b3 179; d=3
? U+00b9 185; d=1
? U+00bc 188; d=0.25
? U+00bd 189; d=0.5
? U+00be 190; d=0.75
class Program
{
static void Main(string[] args)
{
for (char c = (char)1; c <= 200; c++) //char.MaxValue
{
//Console.WriteLine("number = " + char.GetNumericValue(c) + "; char = " + c.);
double d = char.GetNumericValue(c);
if (d != -1)
{
Console.WriteLine("{0} U+{1:x4} {2}; d={3}", c, (int)c, (int)c, d);
}
}
Console.ReadLine();
}
}
Wow, while I was writing - you chose this stupid method! :)
Exctract 48, my advice!. I don't claim any points :)
Exctract 48, my advice!. I don't claim any points :)
Subtract :)
@anarki_jimbel
As specified by the docs:
Granted that doesn't much explain the return value of 0.25, but based on this statement:
I believe the implication is that some mathematical calculation is going to occur. Unless you know some new-fangled math that uses '%' as a valid value, then I'd say there is nothing wrong with char.GetNumericValue = )
Why it returns 0.25 for a '%' character, e.g.?!The method is called GetNumericValue... why would you call it on something you knew want' numeric!?!?! ; )
As specified by the docs:
The numeric value of c if that character represents a number; otherwise, -1.0.
Granted that doesn't much explain the return value of 0.25, but based on this statement:
...then I need to convert 48 to int 0 for calculate.
I believe the implication is that some mathematical calculation is going to occur. Unless you know some new-fangled math that uses '%' as a valid value, then I'd say there is nothing wrong with char.GetNumericValue = )
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