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← 3.3 Identifiers and Operators

Type conversion before arithmetic

Computer Studies · Grade 10 · about 40 minutes

input() is text. int() and float() turn it into a number. str() turns a number into text. Forgetting this joins "50" and "20" into 5020.

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Other lessons in this sub-strand

  1. The elements of a program: identifiers, variables and input/output
  2. Operators
  3. How a program is structured
  4. Syntax and the three kinds of error
  5. Reserved words you cannot use as names
  6. Identifiers and naming rules
  7. Data types: integer, float, string and Boolean
  8. Type conversion before arithmetic
  9. Declaring variables in Python (and how C differs)
  10. Constants: VAT, PI and a fee rate
  11. Input statements: reading the user
  12. Output statements: showing the result
  13. Arithmetic operators in Kenyan calculations
  14. Relational operators: questions that answer True or False
  15. Logical operators: and, or, not
  16. Assignment and compound assignment
  17. Operator precedence: when in doubt, brackets
  18. Standard libraries: math and random