Wrong number or types of arguments error using cursors with parameters - sql

Question

I am getting this error trying to have an input parameter "var_city" in my cursor so I can use the user's input of a city.
Error report -
ORA-06550: line 17, column 5:
PLS-00306: wrong number or types of arguments in call to 'CUSTOMERS'
ORA-06550: line 17, column 5:
PL/SQL: SQL Statement ignored
06550. 00000 - "line %s, column %s:\n%s"
*Cause: Usually a PL/SQL compilation error.
*Action:
p_city is commented out because I was trying to use that input parameter as the value used but it didn't work as well.
SET SERVEROUTPUT ON
SET VER OFF
-- ACCEPT p_city PROMPT 'Enter city name: '
DECLARE
v_custname si.customer.custname%TYPE;
v_total_spent NUMBER;
v_total_cars NUMBER;
CURSOR customers (var_city varchar2) IS
SELECT
custname
FROM
si.customer
WHERE
UPPER(custcity) = UPPER(var_city);
BEGIN
dbms_output.put_line('Customer Name'
|| 'Total Cars'
|| 'Total Spent');
OPEN customers;
LOOP
FETCH customers INTO v_custname;
EXIT WHEN customers%NOTFOUND;
cust_total_spending_and_cars(v_custname, v_total_cars, v_total_spent);
dbms_output.put_line(v_custname
|| v_total_cars
|| v_total_spent);
END LOOP;
CLOSE customers;
END;
/

Answer 1

An argument must be passed to the OPEN statement
Change this line:
OPEN customers;
To something like this:
OPEN customers('city name here');