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Algorithm design option one - flow diagram

Algorithm design option two - pseudocode

#set error flag to True to enable loop
error = True

#iterate until a valid password is entered
while error == True

    #set all variables to default values
    error = False
    lowerCase = 0
    upperCase = 0
    number = 0

    #input the password
    password = input ("Type in a password of at least 5
    characters including 1 l/c letters, 1 u/c, 1 number: ")

    #check password length - error if not at least 5 characters
    if len(password)< 5 then
        error = True
     endif

    #if the password is the right length then
    #inspect each character in the password
    #add 1 to the number of uppercase for each uppercase character
    #add 1 to the number of lowercase for each lowercase character
    #add 1 to the number of numbers for each number
    if error == False then
        for position in range(0,len(password))
            if password[position] >="A" and password[position]
            < ="Z" then
                    upperCase += 1
            elseif password[position] >="a" and
            password[position]< ="z" then
                lowerCase += 1
            elseif password[position] >="0" and
            password[position]< ="9" then
                number += 1
     next position
   endif

   #if character requirements are not met, an error has occured
   if upperCase < 1 or lowerCase < 1 or number < 1 then
       error = True
    endif

#output acceptance
print("Password accepted: ",password)

Testing table

Tests will be required to test that the final program runs correctly.

The problem has now been fully decomposed and an algorithm has been designed.