softwore32:swift software32$ vi fpf.swift
let numberOfStoplights = 4
var population: Int
population = 15422
var unhiredRate: Double = 0.1
let message: String
if popilation <10000{
message = "\(name) is a small town."
}
else if population <1000{
message = "\(name) is a medium town."
}
else{
message = "\(name) is a large town."
}
let description = "name:\(name)\n"
+"stoplights:\(numberOfStoplights)\n"
~
~
~
~
"fpf.swift" 19L, 388C
public class Flips {
public static void main(String[] args){
int N = Integer.pareInt(args[0]);
Couter heads = new Counter("Head");
Couter tails = new Counter("Tail");
for (int i = 1; i<= N; i++)
if (StdRandom.bernoulli(0.5))
heads.increment();
else
tails.increment();
Int delte = heads.tally() - tails.tally();
StdOut.println(heads);
StdOut.println(tails);
StdOut.println("delta:"+delta);
}
上课代码2
import edu.printceton.cs.algs4.StdRandom;
import edu.printceton.cs.algs4.StdRandom;
public class Rolis {
public static void main(String[] args){
int N = Integer.parseInt(args[0]);
Counter[] counters = new Counter[sides + 1]
for (int i = 1; i<=sides;i++)
counters[i] = new Counter("" + i);
for (int i = 1; i <= N;i++){
int result = new Counter(""+ i )
for (int i = 1; i<=sides;i++)
stdOut.println(counters[i]);
}任务累加器
avg'平均数
累加器信息输出。累加多少个数+avg
public class Accumulator {
private double sum = 0.0;
private int N = 0;
public void add(double value){
sum += value;
N++;
}
public double mean(){
if (N == 0 )
return 0;
return sum / N;
}
public String toString(){
return "Mean(" + N + "values):"
+ String.format("%".3f,mean());
}
}
符攀飞