String handling operations in a programming language: integer to string

The idea

Converting an integer to a string means turning a whole-number value, such as 42, into text "42" so it can be joined to other text or displayed as characters. This is needed when concatenating a number with a message, for example building "Score: " + 42, which fails unless 42 is first converted to a string. The learner should recognise the operation, know the target type is string, and predict the result: the integer 42 becomes the two-character string "42". The digits are unchanged but the type is now text, so it can be concatenated or its length measured. Converting back would need string-to-integer.

What earns the marks

• Identifies that integer-to-string conversion changes a whole-number value into a text (string) value.
• Recognises the need to convert before concatenating a number with text.
• States the target type is string and the digits are preserved, e.g. 42 becomes "42".
• Predicts that the resulting string can be concatenated or have its length measured.
• Distinguishes this from string-to-integer, which reverses the direction.

Common mistakes and how to put them right

• Trying to concatenate an integer directly with text.

  Put it right: Is to convert the integer to a string first.

• Confusing direction with string-to-integer.

  Put it right: Is that integer-to-string produces text from a number.

• Assuming the value changes.

  Put it right: Is that the digits stay the same but the data type becomes string.

Exam tips

• Identify the source type (integer) and target type (string) before answering.
• Link the conversion to a use such as concatenation or display.
• Check the direction: integer to string, not string to integer.