===== HyperFun: Statements =====
There are four types of the statements each ending with ';':
  * [[hf_statements#assignment_statement_for_a_variable|Assignment statement for a variable]]
  * [[hf_statements#assignment_statement_for_an_array|Assignment statement for an array]]
  * [[hf_statements#conditional_statement|Conditional statement]]
  * [[hf_statements#iterative_statement|Iterative statement]]

==== Assignment statement for a variable. ====
Its general form is:

//<localVarName> '=' <functional expression> ';'//

Here //<localVarName>// is a name of any local variable (including name of array's element) or a name of a coordinate variable.
Examples:

''i = 1;\\ 
i = i + 1;\\ 
x1 = x[1] + a[1];\\ 
Metric[2] = b + aa[I]* exp(-sqrt(xx1^2 + x[2]^3);\\ 
StrangeBody = Head | (Hand[1] & Leg[2]);\\ 
sphere1 = Sphere(x,a);''

==== Assignment statement for an array. ====

This statement allows to assign values to all elements of array. Its general form is:

//<ElemArrayName> '=' '[' <constant>, ..., <constant> ']' ';'//

Example:

''pz = [100., -20, 2, 0., 0., -3, 0., 0., 1E-10];''

==== Conditional statement ====

It is a traditional 'if-then-else' statement having two forms:
  * //'if' <boolean expression> 'then' <statements> 'endif' ';'//
  * //'if' <boolean expression> 'then' <statements> 'else' <statements> 'endif' ';'//

Example: 

''if (x[4]= 0) then metamorph = CSGobject;\\ 
    else if (x[4] = 1) then metamorph = blobbyobject;\\ 
        endif;\\ 
endif;''

==== Iterative statement ====

The iterative statement allows to define repeating loops. Its general form is:

//'while' '(' <boolean expression> ')' 'loop' <statements> 'endloop' ';'//

Example: 

''i=1;\\ 
while (i<10) loop\\ 
    xt[i] = x[1] - x0[i];\\ 
    i = i+1; \\ 
endloop;''