Basics part 3

# Let's talk about arguments and parameters. The terms arguments and parameters are same information passed to function.

# There is differnce between both of them. A parameter is variables in function definition i.e. when function is defined.

# An argument is variable sent when the function is called.

def newfunction(num1,num2): # The variables num1 and num2 are parameters here in function definition.  

  value = 2*(num1+num2)

  return value

n1 = 100

n2 = 200

ans = newfunction(n1,n2) # Here variables n1 and n2 are arguments.

print(ans)

def simpleinterest(p,t,r=10): # non-default arguments always come before default arguments.

  si=(p*r*t)/100

  return si

def total(p,si):

  return p+si

principle=int(input("Enter principle"))

rate=int(input("Enter rate"))

time=int(input("Enter time"))

si= simpleinterest(principle,time,rate) # Teacher make both cases once pass value with rate and once without rate that means remove rate.

# si= simpleinterest(principle,time) # Here rate will always be considered 10

print(si)

amount=total(principle,si)

print(amount)

COMPOUND INTEREST FORMULA

Source: https://byjus.com/maths/compound-interest/ 

# We have passed different data types inside function so let's pass list as argument.

#

def studentnames(names):

  for x in names:

    print(x)

names=['Ethan','Ali','Kenneth','Keyza']

studentnames(names)

# As you have seen that in each program we have to makesure the order of parameters and arguments.

# There is a way that we don't have to care about the order to pass values and it is called as Keyword Arguments.

# Let's say someone is having 4 students but he wants to pass value to function randomly but access the name of fourth student.

# In Keyword Arguments the variable name of parameters and arguments is same.

def students(stu3, stu2, stu4, stu1 ): # Here the names are passed randomly but the name of right student will be printed.

  print("The youngest child is " + stu4)

students(stu1 = "Emily", stu2 = "Tobias", stu3 = "Tantowi", stu4="Devin")

# Now we will learn about Arbitrary Arguments.

# If you do not know how many arguments that will be passed into your function,

# add a * before the parameter name in the function definition.

# This way the function will receive a tuple of arguments, and can access the items accordingly.

def names(*students): # Because we don't know how many arguments are passed or we don't want to write all of them.

                      # We can take a variable with * in starting then find the arguments just like tuple.

                      # It is immutable can't be changed. We can't change value in students.

  print("The second student is", students[1])

names("Robert","Samuel","Omar","John")