POO tp_codecheck added
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TiagoRG
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# Tabela Exercício 1 de Strings
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| Question | Answer |
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------|
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| What is the length of the string below?<br>String str = "Java Program" | 12 |
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| With str as defined above, give a call to the substring method that returns the substring "gram". | str.substring(8) |
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| Use the string concatenation operator to change the string variable str to contain the string "Java Programming". | str += "ming" |
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| What does the following statement sequence print?<br><br>String str = "Harry";<br>int n = str.length();<br>String mystery = str.substring(0, 1) + str.substring(n - 1, n);<br>System.out.println(mystery); | Hy |
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| Consider the following statement sequence. If the user provides the input John Q. Public, what is printed? If an error occurs, type error.<br><br>Scanner in = new Scanner(System.in);<br>String first = in.next();<br>String last = in.next();<br>System.out.println(last + ", " + first); | Q., John |
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package tp_codecheck.tp01;
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// Solução do exercício 2
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import java.util.Scanner;
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/**
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This program updates an account balance, according to the table below:
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Balance Interest Rate Charge
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> $100,000.00 2.75 % $ 0.00
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> $25,000.00 2.00 % $ 0.00
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> $10,000.00 1.00 % $ 0.00
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>= $0.00 0.00 % $ 0.00
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< $0.00 0.00 % $ 25.00
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and prints out the new balance.
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*/
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public class BankInterest
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{
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public static void main(String[] args)
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{
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// Define constants
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final double HI_RATE = 2.75;
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final double MD_RATE = 2.00;
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final double LO_RATE = 1.00;
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final double ZERO_RATE = 0.00;
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final double DEB_CHG = -25.00;
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final double HI_LIMIT = 100000.00;
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final double MD_LIMIT = 25000.00;
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final double LO_LIMIT = 10000.00;
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final double ZERO_LIMIT = 0.00;
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// Print prompt to enter a current balence
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System.out.print("Enter current balance: ");
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// Read balance
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Scanner in = new Scanner(System.in);
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double balance = in.nextDouble();
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// Determine interest rate (or charge) based on current balance
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// to compute new balance
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// Your work here
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double newBalance;
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if (balance > HI_LIMIT)
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newBalance = balance*(1+HI_RATE/100);
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else if (balance > MD_LIMIT)
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newBalance = balance*(1+MD_RATE/100);
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else if (balance > LO_LIMIT)
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newBalance = balance*(1+LO_RATE/100);
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else if (balance < ZERO_LIMIT)
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newBalance = balance+DEB_CHG;
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else
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newBalance = balance;
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System.out.printf("%.2f\n", newBalance);
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}
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}
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package tp_codecheck.tp01;
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// Solução do exercício 3
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public class Table {
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public static void main(String[] args) {
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System.out.printf("%s | %s | %s | %s\n", "n", "Hn", "log n", "Hn - log n");
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int n = 1;
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while (n <= 1000000) {
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double f1 = harmonic(n);
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double f2 = Math.log((double)n);
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System.out.printf("%d | %.3f | %.3f | %.9f\n", n, f1, f2, f1-f2);
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n *= 2;
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}
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}
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/**
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* Computes the Harmonic number Hn = 1 + 1/2 + 1/3 + ... + 1/n.
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*/
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private static double harmonic(int n) {
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double sum = 0;
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for (int i = 1; i <= n; i++) {
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sum += 1/(float)i;
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}
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return sum;
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}
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}
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package tp_codecheck.tp01;
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// Solução do exercício 1
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/*
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This is a short Java program to convert
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a temperature from Celsius to Fahrenheit.
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*/
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// You may want to import stuff here...
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import java.util.Scanner;
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public class Temperature {
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// Create a Scanner to parse standard input:
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private static Scanner sc = new Scanner(System.in);
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public static void main(String[] args) {
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// Put your code here
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System.out.print("Celsius? ");
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double celcius = sc.nextDouble();
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double fahrenheit = 1.8*celcius+32;
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System.out.printf("%f C = %f F\n", celcius, fahrenheit);
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System.out.println("THE END");
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}
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}
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// JMR 2023
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# Tabela Exercício 1 de Strings
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| Question | Answer |
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------|
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| What is the length of the string below?<br>String str = "Java Program" | 12 |
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| With str as defined above, give a call to the substring method that returns the substring "gram". | str.substring(8) |
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| Use the string concatenation operator to change the string variable str to contain the string "Java Programming". | str += "ming" |
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| What does the following statement sequence print?<br><br>String str = "Harry";<br>int n = str.length();<br>String mystery = str.substring(0, 1) + str.substring(n - 1, n);<br>System.out.println(mystery); | Hy |
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| Consider the following statement sequence. If the user provides the input John Q. Public, what is printed? If an error occurs, type error.<br><br>Scanner in = new Scanner(System.in);<br>String first = in.next();<br>String last = in.next();<br>System.out.println(last + ", " + first); | Q., John |
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package tp_codecheck.tp02;
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import java.util.Scanner;
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public class Words {
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public static void main(String[] args) {
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Scanner in = new Scanner(System.in);
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String word = in.next();
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word = word.charAt(word.length()-1) + word.substring(1, word.length()-1) + word.charAt(0);
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System.out.println(word);
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}
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}
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