Numeric input

301.6 Input

Input — Note 2 of 3

Cast input to numbers.

What you need to know

Since input() always returns a string, you must cast it to int or float before doing maths. Wrap the input() call inside int() or float().

What to know

int(input("Age: ")) converts to integer in one line
float(input("Price: ")) for decimals
Without casting, + concatenates instead of adding
Invalid input (e.g. letters for int) causes ValueError

Code examples

Numeric input

python

age = int(input("Enter your age: "))
next_year = age + 1
print("Next year you will be", next_year)

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Specification notes for programming are in Paper 2.

Numeric input

301.6 Input

Practise exam questions

Input — Note 2 of 3

Cast input to numbers.

What you need to know

Since input() always returns a string, you must cast it to int or float before doing maths. Wrap the input() call inside int() or float().

What to know

int(input("Age: ")) converts to integer in one line
float(input("Price: ")) for decimals
Without casting, + concatenates instead of adding
Invalid input (e.g. letters for int) causes ValueError

Code examples

Numeric input

python

age = int(input("Enter your age: "))
next_year = age + 1
print("Next year you will be", next_year)

← Previous noteInput basics301.6 Input Next note →IPO Pattern301.6 Input

Back to Input

Specification notes for programming are in Paper 2.