Built-in Functions

Use the built-in functions abs(), round(), sqrt(). A built-in function is one that you don’t need to install and load a package to use. Use another function, help(), to learn how to use any of the functions that you don’t know how to use appropriately. help() takes one parameter, the name of the function you want information about. E.g.,help(round).

  1. The absolute value of -15.5.
  2. 4.483847 rounded to one decimal place. The function round() takes two arguments, the number to be rounded and the number of decimal places.
  3. 3.8 rounded to the nearest integer. You don’t have to specify the number of decimal places in this case if you don’t want to, because round() will default to using 0 if the second argument is not provided. Look at help(round) or ?round to see how this is indicated.
  4. Assign the value of the square root of 2.6 to a variable. Then round the variable you’ve created to 2 decimal places and assign it to another variable. Print out the rounded value.
  5. Do the same thing as task 4 (immediately above), but instead of creating the intermediate variable, perform both the square root and the round on a single line by putting the sqrt() call inside the round() call.
[click here for output]