Total([0, 3, 6]) returned 15 instead of 9


#1

Hello,

There is a mistake in my code somewhere but I can't find it:

'n = [3, 5, 7]

def total(numbers):
result = 0
for i in n:
result += i
return result'

The error message suggests that n[2] is being added twice, which is yielding an inaccurate result. Please explain.

I appreciate the diligent work you do to help anyone learning programming. The world needs more resources like codecademy


#2

@2966841,

n = [3, 5, 7]

def total(numbers):
    #4 space indent
    #the numbers PARAMETER is used as a VARIABLE
    #numbers will get the VALUE of the ARGUMENT given
    print "== init ========================="
    print "{0} {1}".format("The VALUE of =numbers= ",numbers)
    result = 0
    print "{0} {1}".format("init Value of =result= ",result)
    for i in numbers:
        #4 space indent
        #FOR-loop code-block
        print "== FOR loop iteration ==========="
        print "{0} {1}".format("result before: ",result)
        result += i
        print "{0} {1}".format("result after: ",result)
    #End of FOR-loop code-block
    #and END-of-FUNCTION
    print "== FOR loop ended ============="
    print "{0} {1}".format("result VALUE to be returned",result)
    return result

print total(n)

===================================================

== init =========================
The VALUE of =numbers= [3, 5, 7]
init Value of =result= 0
== FOR loop iteration ===========
result before: 0
result after: 3
== FOR loop iteration ===========
result before: 3
result after: 8
== FOR loop iteration ===========
result before: 8
result after: 15
== FOR loop ended =============
result VALUE to be returned 15
15


#3

@2966841,

the FUNCTION talk

def myFunc( param1, param2):
    # Begin of =myFunc= FUNCTION-BODY
    # this =myFunc= function- has 2 PARAMETERS param1 and param2
    # param1 and param2 PARAMETERS are used 
    # as -local- VARIABLES throughout the =myFunc= FUNCTION-BODY
    print( param1 + " and " + param2 )
    #End of =myFunc= FUNCTION-BODY

If you want to call/execute the myFunc function
you will have to add a pair of parentheses to myFunc
like
myFunc()
As the myFunc function was defined
as having 2 parameters
you have to provide 2 arguments
in our case 2 string VALUES "Alena" and "Lauren"
like
myFunc("Alena","Lauren")

some quotes from the outer-world:

**argument is the value/variable/reference being passed in,
parameter is the receiving variable used within the function/block**

OR

**"parameters" are called "formal parameters",
while "arguments" are called "actual parameters".**

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++ function with 1 parameter using return-statement

def myFunction( param1 ):
    # //Begin of =myFunction= FUNCTION-BODY
    # //=myFunction= function has 1 PARAMETER param1
    # //this param1 PARAMETER is used as a -local- VARIABLE
    # //throughout the =myFunction= FUNCTION-BODY
    return param1;
    # //End of FUNCTION-BODY

You have defined a myFunction function
which takes 1 parameter param1
this param1 parameter is used
as a variable throughout the =myFunction= FUNCTION-BODY.

If you want to call/execute this myFunction function
and this myFunction function was defined
as having 1 parameter param1
you will have to provide 1 argument
in our case a "number VALUE" 4
myFunction( 4 )

some quotes from the outer-world:

**argument is the value/variable/reference being passed in,
parameter is the receiving variable used within the function/block**

OR

**"parameters" are called "formal parameters",
while "arguments" are called "actual parameters".**

============================================

As you are using the return-statement in your myFunction function
you will only get a return-value no-display.
You can however capture this return-value in a variable
and then use the print-method to do a display.

theResult = myFunction( 4 )
print theResult

OR directly

print myFunction( 4 )

#4

I had the same error.

You have to put: "for i in numbers" and not "for i in n"