在坚固的默认存储位置，这取决于哪种类型的变量的关注

在坚固的默认存储位置，这取决于哪种类型的变量的关注

'state variables' are always in 'storage'
'function arguments' are always in 'memory'
local variables of 'struct', 'array' or 'mapping type' reference 'storage' by default
local variables of value type (i.e. neither array, nor struct nor mapping) are stored in the stack