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The problem of defining character array in keil
void main()

{

P0 = 0xff

p 1 = 30;

uchar ubox[2]; ************************

You can put the definition of the array outside the main () function or before P0 = 0xFF.

C language is not allowed to execute before variable definition. For example, if you have P0 = 0xFF, it belongs to execution. Then, after execution, you are not allowed to define any variables. This is the grammar of C language, but C++ is also acceptable.

For example, for (int I = 0;; I<9; I++), this sentence can't pass in C language, but it's ok in C++.