JCH
Java Community | Help. Code. Learn.ā€¢5d ago
š“pothicon

Packing 2 bit numbers into an int.

I have an array of ints where each int represents 16 blocks, I am attempting to set and read groups of 2 bits within the int as their own numbers, but am getting numbers I did not put in. (ex. i write a 2 in but it gives me a 3 when reading) This is how I'm setting the values: (key is the new value) 
int intPos = pos / 16;
int whereInInt = pos - (intPos * 16);
blockData[intPos] |= (key & 0x3) << (whereInInt*2);
int intPos = pos / 16;
int whereInInt = pos - (intPos * 16);
blockData[intPos] |= (key & 0x3) << (whereInInt*2);
This is how I'm getting the values: 
int intPos = pos / 16;
int values = blockData[intPos];
int whereInInt = pos - (intPos * 16);
return (values >> (whereInInt*2)) & 0x3;
int intPos = pos / 16;
int values = blockData[intPos];
int whereInInt = pos - (intPos * 16);
return (values >> (whereInInt*2)) & 0x3;
1 Reply
JavaBot
JavaBotā€¢5d ago
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