FPGA blocking assignment and non blocking assignment

Block assignment :      It was used = Number

Nonblocking assignment :      It was used <= Number

Assume initialization is a = 1, b = 2

Block assignment : 

//  initialization a = 1, b = 2
[email protected](posedge clk)

begin

       b = a;

       c = b;

end

// After operation c = b = 1

Nonblocking assignment :

//  initialization a = 1, b = 2
[email protected](posedge clk)

begin

       b <= a;
       c <= b;

end

// After operation b = 1, c = 2
 

Suggest ：

stay assign of use = Number

stay always of use <= Number