We use <- to assign values to the variables.
We can also assign values using = instead of <-, but we recommend against using = to avoid confusion.
a <- 1
b <- -3To see the value stored in a variable, we simply ask R to evaluate a and it shows the stored value:
a
#> [1] 1A more explicit way to ask R to show us the value stored in a is using print like this:
print(a)
#> [1] 1
# Assign three variables
a <- 1
b <- -3
# print variable 'a' without 'print' function
# display variable 'b' by using 'print' function
# Assign three variables
a <- 1
b <- -3
# print variable 'a' without 'print' function
a
# display variable 'b' by using 'print' function
print(b)
test_object("a", undefined_msg = "Make sure to define a variable `a`.",
incorrect_msg = "Make sure that you assign the correct value to `a`.")
test_object("b", undefined_msg = "Make sure to define a variable `b`.",
incorrect_msg = "Make sure that you assign the correct value to `b`.")
test_output_contains("a", incorrect_msg = "Make sure that you should type a to print out value in variable 'a'.")
test_output_contains("print(b)", incorrect_msg = "Make sure that you should use print function to print out value in variable 'b'.")
test_function("print")
success_msg("Great! Head over to the next exercise.")