Does simulink support calculation in which a declared variable can change its value?

   for example, for any declared variable "U"
U = U+5; 
U = U*a;

   I found that after a variable is calculated by a block, its output always become another variable. such as
C = U+5; 
B = U*a;

 Thanks 
    Tehsin

what do you mean? It's obvious, after U=U+5, U will change

 Hi Azzi Abdelmalek :
 Thanks for your reply.

 I want "U" as an global variable,but it is always replaced by an local   after using Simulink Coder to generate C code. The C syntax will be ,for example, "loc = U + 1;" not "U = U + 1;"

 So, how do I use simulink to create a global that satisfies the C syntax as "U++;" or "U=U*5;"

 ex: 
 simulink:
		(in_global)--->[*5]--->(out_local)
 simulink Coder:
		int  out_local; 
		out_local = in_global * 5;

 How to create the code as "in_global = in_global * 5;"

 Thank you

Answer 1

If I understand correctly, you want use U as a global variable. Is it correct?

 Hi SACHIN:
 Thanks for your reply.

 Yes, I want "U" as an global variable. 
 But the global variable is always replaced by an local   after I use  Simulink Coder to generate C code.

 So, how do I use simulink to create a global that equal to the C syntax  as "U++;" or ''U=U*5;"

 ex: 
 simulink:
		(in_global)--->[*5]--->(out_local)

 simulink Coder:
		int  out_local; 
		out_local = in_global * 5;

   How to create the code as "in_global = in_global * 5;"

Thank you