1. 决策

1.1 if 条件语句

在许多情况下，你需要根据条件做出决定。

为此，可以使用 if 语句。

例如：

x <- 24
if(x > 10){
    print( "x is greater than 10")
}

Homework 8

Exercise 1: Sieve of Eratosthenes

Early in the course, we saw a few naive ways to output a list of prime numbers. Although we were able to improve the speed of the search a lot by incorporating a few arithmetic insights, it still took longer than it needed to for somewhat larger numbers.

Data analysis

For this lab you'll use dictionaries to collect statistics for a simple data file representing a collection of users. Begin by downloading the starter code and data hereLinks to an external site.