从查找表将字符串转换成数据 [英] Converting a String to data from a lookup table
问题描述
我有我写了有26 INT阵列重新presenting的英文字母的程序。他们每个人都包含重新将显示屏上亮起present灯5二进制数。我需要做的是将字符串转换成二进制数据。例如,如果你看一下下面的code:
I have a program that I have written that has 26 int arrays representing the letters of the alphabet. They each contain 5 binary numbers that represent Lights that will be lit up on a display. What I need to do is to convert a string into the binary data. For example, If you look at the code below:
int B[] = {B1111111, B1001001, B1001001, B0110110, B0000000};
int O[] = {B0111110, B1000001, B1000001, B0111110, B0000000};
因此,如果字符串是BOB我需要它来创建一个数组,看起来是这样的:
So if the string was "BOB" I need it to create an array that looks something like this:
int CurrentWord[] = {B1111111, B1001001, B1001001, B0110110, B0000000, B0111110, B1000001, B1000001, B0111110, B0000000, B1111111, B1001001, B1001001, B0110110, B0000000};
我可以看到也许与一群交换机这样做,但必须有一个更好的办法。
I can see maybe doing this with a bunch of switches, but there must be a better way.
PS,我知道我的code是目标C,我要做到这在C#
PS, I know my code is in objective c, I am looking to do this in C#
推荐答案
这是一个数组的数组的工作。
This is a job for an array of arrays.
int[][] map = new int[26][];
map[0] = {B0000000, B0000000, B0000000, B0000000, B0000000}; // Letter "A"
map[1] = {B1111111, B1001001, B1001001, B0110110, B0000000}; // Letter "B"
... Populate the array ...
要做好查找,得到大写字符的ASCII值(将是从64到90),并减去64 ,并使用它作为您的数组索引:
To do the lookup, get the ASCII value of the upper-case character (which will be from 64 to 90) and subtract 64, and use that as your array index:
char c = 'B'; // char can be treated as an int
int index = toupper(c) - 'A'; // See the link above for an explanation
int[] result = map[ascii]; // Returns the map for "B"
显然,完成这一关,你需要遍历所有的字符和每个结果复制到你的输出。
Obviously, to finish this off, you'd need to loop over all chars and copy each result to your output.
NSString *myString = [NSString stringWithString:@"Tanner"];
unichar c;
for(int i=0; i<[myString length]; i++) {
c = [myString characterAtIndex:i];
// char can be treated as an int
int index = toupper(c) - 'A'; // See the link above for an explanation
int[] result = map[ascii]; // Returns the map for "B"
... Append the result to a list of results ...
}
请原谅任何Objective-C的语法问题,问题是标签的C#,所以我不得不去适应的Objective-C。
Please excuse any Objective-C syntax issues, the question is tagged C#, so I had to adapt to Objective-C.
这是在C#的方式更容易。这个概念是一样的,但code是更整洁。
This is way easier in C#. The concept remains the same, but the code is much neater.
public static class Lights
{
public static byte[] Encode(string input)
{
// Convert to ASCII values, get the map, and flatten it:
return input.ToUpper().SelectMany(c => map[c-65]).ToArray();
}
// Note: C# does not have Binary Literals, so here's an alternative:
private const byte B0000000 = 0, B0000001 = 1, B0000010 = 2, B0000011 = 3, B0000100 = 4, /* ETC */ B1111111 = 127, B1001001 = 73, B0110110 = 102, B0111110 = 126, B1000001 = 129;
// Create the map:
private static byte[][] map = new []{
/* A */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* B */ new[]{ B1111111, B1001001, B1001001, B0110110, B0000000 },
/* C */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* D */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* E */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* F */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* G */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* H */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* I */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* J */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* K */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* L */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* M */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* N */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* O */ new[]{ B0111110, B1000001, B1000001, B0111110, B0000000 },
/* P */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* Q */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* R */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* S */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* T */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* U */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* V */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* W */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* X */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* Y */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
/* Z */ new[]{ B0000000, B0000000, B0000000, B0000000, B0000000 },
};
}
下面是如何得到的结果:
Here's how to get the results:
byte[] lights = Lights.Encode("BOB");
一对夫妇很酷的事情需要注意:C#用于遍历字符串,如果它是一个字符数组,它可以让你执行焦炭数学,所以code是超级简单。耶!
A couple of cool things to note: C# lets you iterate a string as if it was a char array, and it lets you perform char math, so the code is super-simple. Yay!
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