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-rw-r--r--ap-computer-science-a-exam/QuestionOne.java82
-rw-r--r--ap-computer-science-a-exam/q1.txt40
-rw-r--r--ap-computer-science-a-exam/q2.txt28
3 files changed, 150 insertions, 0 deletions
diff --git a/ap-computer-science-a-exam/QuestionOne.java b/ap-computer-science-a-exam/QuestionOne.java
new file mode 100644
index 0000000..3b61fab
--- /dev/null
+++ b/ap-computer-science-a-exam/QuestionOne.java
@@ -0,0 +1,82 @@
+import java.util.ArrayList;
+
+class Trial {
+ private int trialNum;
+ private double temperature;
+ private String compoundName;
+ private double amountUsed;
+ public Trial(int num, double temp, String compound, double amt){
+ trialNum = num;
+ temperature = temp;
+ compoundName = compound;
+ amountUsed = amt;
+ }
+ public int getTrialNum(){ return trialNum; }
+ public double getTemp(){ return temperature; }
+ public String getCompound(){ return compoundName; }
+ public double getAmtUsed(){ return amountUsed; }
+}
+
+class ScienceExperiment {
+ private ArrayList<Trial> trialList;
+ public double getCompoundAvg(String comp){
+ int ct = 0;
+ double totalTemp = 0;
+ for (Trial trial : trialList){
+ if (trial.getCompound() != comp) continue;
+ ct++;
+ totalTemp += trial.getTemp();
+ }
+ if (ct > 0) return totalTemp/ct;
+ else return -1;
+ }
+ public ArrayList<String> getCompoundList(){
+ ArrayList<String> out = new ArrayList<String>();
+ for (Trial trial : trialList){
+ if (!out.contains(trial.getCompound()))
+ out.add(trial.getCompound());
+ }
+ return out;
+ }
+ public String getCompoundWithHighestAvg(){
+ double max = -1; // less than all non-negative temperatures.
+ String compound = ""; // to make java behave
+ for (String curCompound : getCompoundList()){
+ double avg = getCompoundAvg(curCompound);
+ if (avg > max){
+ max = avg;
+ compound = curCompound;
+ }
+ }
+ return compound;
+ }
+ public void add(Trial trial){
+ trialList.add(trial);
+ }
+ public ScienceExperiment(){
+ trialList = new ArrayList<Trial>();
+ }
+ public double getCompoundAmountUsed(String compound){
+ double sum = 0;
+ for (Trial trial : trialList){
+ if (trial.getCompound() == compound)
+ sum += trial.getAmtUsed();
+ }
+ return sum;
+ }
+}
+
+public class QuestionOne {
+ public static void main(String[] args){
+ ScienceExperiment exp = new ScienceExperiment();
+ exp.add(new Trial(1,70,"alkynes",1));
+ exp.add(new Trial(27,100,"ketones",15));
+ exp.add(new Trial(29,80,"ketones",2));
+ exp.add(new Trial(35,90,"ethers",3));
+ System.out.println(exp.getCompoundAvg("alkynes"));
+ System.out.println(exp.getCompoundAvg("ketones"));
+ System.out.println(exp.getCompoundAvg("thiol"));
+ System.out.println(exp.getCompoundAmountUsed("ketones"));
+ System.out.println(exp.getCompoundWithHighestAvg());
+ }
+}
diff --git a/ap-computer-science-a-exam/q1.txt b/ap-computer-science-a-exam/q1.txt
new file mode 100644
index 0000000..fe2b68e
--- /dev/null
+++ b/ap-computer-science-a-exam/q1.txt
@@ -0,0 +1,40 @@
+WY5V8181
+HR
+
+(a)
+
+public double getCompoundAvg(String comp){
+ int ct = 0;
+ double totalTemp = 0;
+ for (Trial trial : trialList){
+ if (trial.getCompound() != comp) continue;
+ ct++;
+ totalTemp += trial.getTemp();
+ }
+ if (ct > 0) return totalTemp/ct;
+ else return -1;
+}
+
+(b)
+
+public String getCompoundWithHighestAvg(){
+ double max = -1; // less than all non-negative temperatures.
+ String compound;
+ for (String curCompound : getCompoundList()){
+ double avg = getCompoundAvg(curCompound);
+ if (avg > max){
+ max = avg;
+ compound = curCompound;
+ }
+ }
+ return compound;
+}
+
+(c)
+
+The programmer would need to add the amount of compound used as a
+private instance variable (with a getter) in Trial (which would be
+initialized in its constructor). ScienceExperiment would hold the method
+`public double getCompoundAmountUsed(String compoundName)` which would
+sum, for all Trials in trialList with the same compoundName as given,
+the value of trial.getAmountUsed(), and return that value.
diff --git a/ap-computer-science-a-exam/q2.txt b/ap-computer-science-a-exam/q2.txt
new file mode 100644
index 0000000..d9ae2aa
--- /dev/null
+++ b/ap-computer-science-a-exam/q2.txt
@@ -0,0 +1,28 @@
+WY5V8181
+HR
+
+(a)
+
+public static boolean runSimulation(int sampleSize){
+ int half = sampleSize/2;
+ int halves[] = { 0, 0 };
+ for (int i = 0; i < 2; i++){
+ for (int j = 0; j < half; j++){
+ int num = getInt();
+ if (num > 0 && isTarget(num)) halves[i]++;
+ }
+ }
+ return (halves[0] > halves[1]);
+}
+
+(b)
+
+The programmer would, instead of using `int sampleSize` as a parameter,
+use a `public final static int sampleSize = $value` where $value is the
+value the programmer wants it to be so that it could be set at compile
+time. If the programmer wants it to be set at runtime instead, the
+programmer could use a basic class-wide declaration `private static int`
+and setter public static void setSampleSize(int size) which would only
+set the variable if it is non-null. Note that static is used for all
+variables and methods because the class does not appear to use
+instances.