Consider a language in which there can three kinds of statements- input,
output and assignment. Each statment is terminated by a semicolon.
    1. An input statement is of the form
		    < id;
    where id is any identifier, and the statement means the user should enter
    a numeric value to be associated to that identifier.

    2. An output statement is of the form
		    > id;
    where id is any identifier, and the statement means the value associated
    with the identifier is printed on the terminal.

    3. An assignment statement is of the form
		    id = expression;
    where id is an identifier and expression is an arithmatic expression
    involving zero or more binary operators +, -, * and /, with their usual
    meanings, and precedence and associativity. The operands can be either
    numeric quantities or identifiers. In case of an identifier as an operand
    the value associated with the identifier (dafult is 0) is to be assumed.
    The assignment statement implies that the expression is evaluated and the
    result should be associated to the identifier to the left of the
    assignment operator =.

Write a program using flex, bison and C to process input in the above
language.