Every register stores 32-bits. Suppose now that the register s1 stores the following 32 bits: 111 1111 where each bit is simply 1.

(1). When I run the instruction add s2, s1, s3, whats the value of the number stored in s1 ?

(2). When I run the instruction addu s2,s1,s3 instead, whats the value of the number stored in s1 ?