if a>b && b>c || c>d then
write a;
end

make a C# function that converts from string to a number (integer or float):

public int cnvrt2num(string txt){
int num = 0 ;
//write code here
return num;
}

line ends with number.
if z1>2;

int x := 3|;
the program will ignore the pipe '|', this is wrong, the program should save the pipe to lexemes.
NOTE take care of space ' '.

And &&
Or ||

32) Function_Body: starts with curly bracket “{” then a set of Statements followed by Return_Statement and ends with “}”
33) Function_Statement: starts with Function_Declaration followed by Function_Body
34) Main_Function: starts with Datatype followed by reserved keyword “main” then “()” followed by Function_Body

15) Declaration_Statement: starts with Datatype then one or more identifiers (assignment statement might exist) separated by coma and ends with semi-colon. (e.g. int x; | float x1,x2:=1,xy:=3; | …)

20) Condition_statement: Conditions OrOp ConditionTerm | ConditionTerm
21) ConditionTerm: ConditionTerm AndOp Condition | Condition
22) Condition: Expression Condition_Operator Expression
25) If_Statement: starts with reserved keyword “if” followed by Condition_Statement then reserved keyword “then” followed by set of Statements (i.e. any type of statement: write, read, assignment, declaration, …) then Else_If_Statment or Else_Statment or reserved keyword “end”
26) Else_If_Statement: same as if statement but starts with reserved keyword “elseif”
27) Else_Statement: starts with reserved keyword “else” followed by a set of Statements then ends with reserved keyword “end”
28) Repeat_Statement: starts with reserved keyword “repeat” followed by a set of Statements then reserved keyword “until” followed by Condition_Statement