1. error: #29: expected an expression

1. Error in compiling the following statement
for(int i=0; i<16; i++)
2. MDK uses C90 by default. It can support C99 after configuration. Modify it according to the following figure

2. error: #223-D: function “BSP_CLK_Init” declared implicitly

F460:
After initializing the BSP_CLK_Init function in main.c and calling it in the main function, this error is reported, indicating that the declaration is not legal.

Referring to the following article, I made a declaration at the beginning of main.c to call extern void BSP_CLK_Init(void);

after which the error disappears.