This question already has answers here:
I need to convert the interest rate to a decimal value
(1 answer)
Why does the division get rounded to an integer? [duplicate]
(13 answers)
Closed 6 years ago.
I am trying to get a float value but it keeps on giving me a decimal value as an answer.
import math
p = int(raw_input("Please enter deposit amount: \n"))
r = int(raw_input("Please input interest rate: \n"))
t = int(raw_input("Please insert number of years of the investment: \n"))
interest = raw_input("Do you want a simple or compound interest ? \n")
A = p*(1+r*t)
B = p*(1+r)^t
if interest == "simple":
print (float(A/100))
else:
print(float(B/100))
float(A/100) first calculates A/100, which are both ints, so the result is an int, and only then converts to float. Instead you could use:
float(A)/100
or:
A/100.
Here is the problem. In python2 the division between integers gives another integer (this is not true in python3).
42 / 100 # return 0
The solution is to keep one to float.
42 / 100.0 #return 0.42
Related
This question already has answers here:
How can I read inputs as numbers?
(10 answers)
Closed 7 months ago.
a=input("Enter the first Number ")
b=input("Enter the next number ")
c=a>b
print("Is a greater than b ? ", c )
ISSUE is it showing the opposite output always like the when you enter a greater than b it showing flase and vice versa
your problem is that you compare strings instead of floats
since when you are comparing stings python compares the lexicographic value of the strings, that way "9" is grater then "12357645"
if you convert the input to float that should fix it :)
a=input("Enter the first Number ")
b=input("Enter the next number ")
c=float(a)>float(b)
print("Is a greater than b ? ", c )
This question already has answers here:
Why does multiplication repeats the number several times? [closed]
(7 answers)
Closed 1 year ago.
I’ve written a piece of code that instead of print the product, prints a number a certain number of times. Whats wrong with it?
twelve = 12
name = input("What is your name? \nAnswer: ")
print("Cool name!")
nums = input("\n\nHow much pocket money did you receive last month?\nAnswer: ")
total = nums * twelve
print("\n\nI think you get ", total + " pounds in pocket money per year! Nice!")
The reason is that your nums variable is a string, which is the default with all Python inputs. Try converting it to int:
nums = int(input(...))
Or float if you are inputting a floating point number.
This question already has answers here:
How can I read inputs as numbers?
(10 answers)
Closed 3 years ago.
I'm beginner in python but I don't understand a thing.
This is the Code:
a = input("Insert first number ")
b = input("Insert second number ")
c = input("Insert third number ")
print("Max number is", max(a, b, c))
For example, I write at prompt:
Insert first number 12
Insert second number 34
Insert third number 100
Max number is 34
I don't understand! Please answer me!
Input returns string and strings are compared lexicographically. You should cast all input results to int, to get numbers.
This question already has answers here:
Python rounding error with float numbers [duplicate]
(2 answers)
Python floating-point math is wrong [duplicate]
(2 answers)
Closed 9 years ago.
first = float(input("Enter first number: "));
second = float(input("Enter second number: "));
avg = float((first + second) / 2);
print(str(avg));
Using the numbers 1.1 and 1.3 as inputs, the expected output is 1.2. However, the result I'm receiving is 1.2000000000000002. I understand that this is related to Python and it's datatypes.
However, I'm unsure of how to evaluate this correctly, or why this specific result is achieved.
EDIT: Python 3.2
Use decimals:
import decimal
first = decimal.Decimal('1.1')
second = decimal.Decimal('1.3')
avg = (first + second) / 2
print(avg)
This question already has answers here:
Why does the division get rounded to an integer? [duplicate]
(13 answers)
Closed 9 years ago.
I have some code that takes values from a dictionary and attempts to figure out the per unit price of an item. However, I cannot figure out how to keep the values from rounding.
If I do this:
total_price = int(item['Item Price'][1:]) #First character is a dollar sign
qty = int(item['Quantity'])
unit_price = total_price/qty
I get this error:
ValueError: invalid literal for int() with base 10: '88.75'
So, I tried floating the value:
total_price = int(float(item['Item Price'][1:]))
qty = int(item['Quantity'])
unit_price = total_price/qty
Which doesn't return an error, but it then rounds up and I only get whole numbers.
How can I get the actual per piece price and not a rounded value? Thanks
Change your qty and total_price to be a float:
total_price = float(item['Item Price'][1:])
qty = float(item['Quantity'])
This will cause the division to be between two floating point values.
Using int explicitly says you want integers, which gives you whole numbers.
The error is occurring during division
>>> print 3/2
1
>>> print 3.0/2
1.5
>>>