Variable & Data Type

Soal Variable & Data Type

1. Saving Values

Instructions

• Save the result of (42 - 11) * 22 to result.
• Print result.

That print(result) outputs 682, not (42-11) * 22. This is because the computer first calculates (42-11) * 22 and then saves the result 20 to result.

2. Variables

Instructions

• Store the value 15 in a variable named a_value.
• Store the result of (25 - 7) * 17 to a variable named a_result.
• Using the print() command, display the following:
• The value stored in the a_value variable.
• The result of adding 12 to the variable a_result.
• The result of adding a_value to a_result.

The storage location for 15 is more commonly known as a variable. When we ran the code result = 15, we stored 15 in a variable (storage location) named result — so result is a variable name.

Note that we need to write the variable name to the left of the = operator and the value we want to store to the right. So if we want to store the value 15 to a variable named result, we must write result = 15, not 15 = result.

3. Variable Names

Instructions

• In the code editor on the right, we attempted to store 34000 in a variable named old-income, and 40000 in a variable named new income. But both of these variable names cause syntax errors, so we commented-out the code.
• Change the variable name old-income to old_income to prevent a syntax error.
• Change the variable name new income to new_income to prevent a syntax error.
• Remove the # from each line so that the code will run, then run the code.

4. Updating Variables

Instructions

• Update the variable income by adding 6000 to its current value.
• The variable income is already shown in the code editor on the right.
• Print income.

5. Syntax Shortcut

Instructions

• Assign a value of 20 to a variable named variable_1.
  Assign a value of 20 to a variable named variable_2.
  Update the value of variable_2 by adding 10 to its current value. You can take advantage of the += operator.
  Update the value of variable_1 by multiplying its current value by 4. You can take advantage of the *= operator.
  Display variable_1 and variable_2 using print().

6. Integers & Floats

Instructions

• Assign the integer 10 to a variable named variable_1.
• Assign the float 2.5 to a variable named variable_2.
• Update the value of variable_1 by adding the float 6.5 to its current value. You can use the += operator.
• Update the value of variable_2 by multiplying its current value by the integer 2. You can use the *= operator.
• Display variable_1 and variable_2 using print().

7. Conversion Between Types

Instructions

• Assign the value 13.9 to a variable named variable_a.
• Assign the value 2.8 to a variable named variable_b.
• Round variable_a using the round() command, and assign back the rounded value to variable_a.
• Convert variable_b from a float to an integer using the int() command, and assign back the converted value to variable_b.
• Display variable_a and variable_b using the print() command.

8. Strings 

Instructions

• Assign the string Pandora - Music & Radio to a variable named app_name.
• Assign the string 4.0 to a variable named average_rating. Make sure you don't mistake a string for a float.
• Assign the string 1724546 to a variable named total_ratings. Make sure you don't mistake a string for an integer.
• Assign the string free to a variable named price.
• Display the app_name variable using print().

9. Escaping Special Characters

Instructions

• Assign the string Facebook's new motto is "move fast with stable infra." to a variable named motto.
• Notice there's a . character at the end of Facebook's new motto is "move fast with stable infra." — you'll need to include the . character in your answer.
• Display the variable motto using print() — displaying motto is required for answer checking.

10. String Operations

Instructions

• Assign the string Facebook's rating is to a variable named facebook.
• Assign the float 3.5 to a variable named fb_rating.
• Convert fb_rating from a float to a string using the str() command, and assign the converted value to a new variable named fb_rating_str.
• Concatenate the strings stored in facebook and fb_rating_str to form the string Facebook's rating is 3.5.
• Assign the concatenated string to a variable named fb.
• You'll need to add a space character between Facebook's rating is and 3.5 to avoid ending up with the string Facebook's rating is 3.5.
• Display the fb variable using print() — this is required for answer checking.