C#•4w ago

Get minimum bytes needed for a number in c#

I have this method in python that gives me the minimum bytes needed for a number

def get_time_byte_size(self, time):
        return (time.bit_length() + 7) // 8

def get_time_byte_size(self, time):
        return (time.bit_length() + 7) // 8

for a number like 122 it will return 1, and for like 257 it will return 2, so on and so forth

5 Replies

mynarcoOP•4w ago

i want to figure out a way to impliment it in python i was doing it like this

    int GetBytesNeeded(ulong val) {
        if(val > 255) return 1;
        else if(val > 65535) return 2;
        else if(val > 16777215) return 3;
        else if(val > 4294967295) return 4;
        return 0;
    }

    int GetBytesNeeded(ulong val) {
        if(val > 255) return 1;
        else if(val > 65535) return 2;
        else if(val > 16777215) return 3;
        else if(val > 4294967295) return 4;
        return 0;
    }

but i want to go as far as 8, and i dont want a super long if statement

Angius•4w ago

Using a logarithm might be helpful

MODiX•4w ago

ero

REPL Result: Success

Console.WriteLine(ByteCount(255));
Console.WriteLine(ByteCount(256));

int ByteCount<T>(T v)
  where T : IBinaryInteger<T>
{
   return (v.GetShortestBitLength() + 7) / 8;
}

Console.WriteLine(ByteCount(255));
Console.WriteLine(ByteCount(256));

int ByteCount<T>(T v)
  where T : IBinaryInteger<T>
{
   return (v.GetShortestBitLength() + 7) / 8;
}

Console Output

1
2

1
2

Compile: 457.477ms | Execution: 29.926ms | React with ❌ to remove this embed.

ero•4w ago

Courtesy of #allow-unsafe-blocks

mynarcoOP•4w ago

oh wait thank you wtf. thats actually very useful

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Get minimum bytes needed for a number in c#