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content/ta/spring2018/cpsc220/feb1.md

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+# Lecture for February 1st
+
+## Control Structures
+
+In this class we will talk about three types of control structures
+
+- Sequential
+- Selection
+- Repetition
+
+Sequential is what is most familiar to us. Write the lines from top to bottom and it executes it in that order
+
+### Selection
+
+Selection depends on the question of `if`. 
+
+If it is raining, wear boots
+
+```java
+if (raining) {
+  wearingBoots = true;
+}
+```
+
+If you want something to happen also when it is not true, consider an `if-else` statement
+
+If the light is off, turn it on.
+
+Otherwise, turn it on
+
+```java
+if (lightIsOn) {
+  lightIsOn = false;
+} else {
+  lightIsOn = true;
+}
+```
+
+Sometimes you can have multiple branches depending on a condition. Let us take a stop light as an example
+
+```java
+if (light == "red") {
+  car.stop()
+} else if (light == "yellow") {
+  car.slow()
+} else {
+  car.go()
+}
+```
+
+## String comparison
+
+There is a specific method in the `String` class when it comes to checking for string equality
+
+```java
+boolean equals(String s)
+```
+
+Let us look at an example
+
+```java
+String word = "hello";
+boolean ans = word.equals("hello"); // Returns true
+boolean ans2 = word.equals("Hello"); // Returns false
+```
+