2.2. VariablesΒΆ
One of the most powerful features of a programming language is the ability to manipulate variables. A variable is a name that refers to a value.
An assignment statement creates new variables and gives them values:
This example makes three assignments and then prints the value of each of the variables. The first assigns a string to a
new variable named message; the second assigns the integer
17 to a variable named n; and the third assigns the (approximate)
value of pi to a variable named pi.
The type of a variable is the type of the value it refers to.
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csp-10-2-2: Using the code above, match the variables up with their type.
Look at the variable assignments above.
- message
- string
- n
- integer
- pi
- float
csp-10-2-3: Click the variables representing strings in this block.Remember that the type of a variable is the type of the value it refers to.
message = 'And now for something completely different' n = 17 number = "123456789" pi = 3.1415926535897931
- name = 'Penelope"
- The quotation marks on each side of the string need to be the same, either single or double, not a mix.
- name = "Penelope"
- An equals sign is needed to assign a variable and quotation marks tell the program that the value is a string.
- name = Penelope
- What symbols are missing to make ``Penelope`` a string?
- name, "Penelope"
- Look at the variable assignments above, what's missing?
csp-10-2-4: How would you assign the variable name to the string Penelope?
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