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split/slice uint
garryplays
New ZealandMember Posts: 5 ✭
in Solidity
I have a couple of keccaks, which could be reduced to one, if I would find a cheap way to get parts of the created uint.
Now the plan is that instead of calling keccak 5 times with different "seeds" I could take that number apart and get something like:
1348, 3274, 8923 etc.
which I then use for my random number e.g.: 1348 % 10
I am lost.
Which returns me a sweet random number: 13483274892375982735325
pragma solidity ^0.4.19;
contract test {
function test() {
}
function sup() returns (uint test) {
uint _test = uint(keccak256("wow"));
return _test;
}
}
Now the plan is that instead of calling keccak 5 times with different "seeds" I could take that number apart and get something like:
1348, 3274, 8923 etc.
which I then use for my random number e.g.: 1348 % 10
I am lost.
Comments
pragma solidity ^0.4.19;
contract test {
event randomNumbers(uint[8] numbers, uint[8] randomNumbers);
function testa() public returns (uint[8] bla) {
//uint something = 12345678123456781234567812345678;
uint something = uint(keccak256("rockandroll"));
uint[8] memory array;
uint[8] memory random;
for(uint i=0; i<8; i++) {
uint digit = something % 10000;
// do something with digit
array[i] = digit;
something /= 10000;
random[i] =digit % 10;
}
randomNumbers(array,random);
return array;
}