What a fuck memset!

This morning, I was thrown into the memset () function again. The result from the C ++ function library is as follows:

We usually get used to assigning values to memset. Today, after an array int sign [1001] is assigned a value to memset (sign,), it cannot be submitted. There is no logic error at all, contributing a lot of WA, after modifying the above sentence, memst (sign, 0, sizeof (sign) will be OK. It seems that I have encountered it once before, but I didn't pay too much attention to parameter issues at the time, the third parameter indicates the number of bytes of the value. It is clear.