Respuesta :
import java.util.Scanner;
public class ReadLine {
public static boolean isUpper(char c) {
if (c >= 'A' && c <= 'Z') {
return true;
} else return false;
}
public static void printUpper(String s) {
for (int i = 0; i < s.length(); i++) {
if (isUpper(s.charAt(i))) {
System.out.print(s.charAt(i));
}
}
}
public static char toLowerCase(char c) {
if (c >= 65 && c <= 90) {
c += 32;
}
return c;
}
public static boolean isLetter(char c) {
return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
}
public static void printSecondLetter(String s) {
int n = 0;
for (int i = 0; i < s.length(); i++) {
if (isLetter(s.charAt(i))) {
if (n % 2 == 1)
System.out.print(s.charAt(i));
n++;
}
}
}
public static boolean isVowel(char c) {
char a = toLowerCase(c);
if (a == 'a' || a == 'o' || a == 'y' || a == 'i' || a == 'u' || a == 'e') {
return true;
} else return false;
}
public static void replaceUnderscore(String s) {
for (int i = 0; i < s.length(); i++) {
if (isVowel(s.charAt(i))) {
System.out.print("_");
} else {
System.out.print(s.charAt(i));
}
}
}
public static int countVowel(String s) {
int count = 0;
s = s.toLowerCase();
for (int i = 0; i < s.length(); i++) {
if (isVowel(s.charAt(i))) {
count++;
}
}
return count;
}
public static void printVowelPosition(String s) {
for (int i = 0; i < s.length(); i++) {
if (isVowel(s.charAt(i))) {
System.out.print(i + " ");
}
}
}
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.print("Input your text: ");
String text = scan.nextLine();
System.out.println();
System.out.print("The uppercase letters in the string: ");
printUpper(text);
System.out.println();
System.out.print("Every second letter of the string: ");
printSecondLetter(text);
System.out.println();
System.out.print("Vowels replaced by an underscore: ");
replaceUnderscore(text);
System.out.println();
System.out.println("The number of vowels in the string: " + countVowel(text));
System.out.print("The positions of all vowels in the string: ");
printVowelPosition(text);
scan.close();
}
Ê ông dân hanu phải khônggg
The program is an illustration of loops.
Loops are used to perform repetitive operations
The program in Java, where comments are used to explain each line is as follows:
import java.lang.*;
import java.util.*;
public class Main {
public static void main(String[] args) {
//This creates a scanner object
Scanner input = new Scanner(System.in);
//This prompts the user for input
System.out.print("Input your text: ");
//This gets the input
String str = input.nextLine();
//The following loop prints the upper case letters
System.out.print("Uppercase letters: ");
for (int i = 0; i < str.length(); i++) {
if (Character.isUpperCase(str.charAt(i))) {
System.out.print(str.charAt(i)+" ");
}
}
//The following loop prints every second letters
System.out.print("\nEvery second letters: ");
int n = 0;
for (int i = 0; i < str.length(); i++) {
if (Character.isLetter(str.charAt(i))) {
if (n % 2 == 1){
System.out.print(str.charAt(i));}
n++;
}
}
char a; int countVowel = 0; String vowelPosition = "";
//The following loop prints the string after the vowels are replaced by underscores
System.out.print("\nThe new string: ");
for (int i = 0; i < str.length(); i++) {
a = Character.toLowerCase(str.charAt(i));
if (a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u') {
System.out.print("_");
//This counts the number of vowels
countVowel++;
//This notes the positions of vowels
vowelPosition+=Integer.toString(i+1)+" ";
}
else {
System.out.print(str.charAt(i));
}
}
//This prints the number of vowels
System.out.print("\nThe number of vowels in the string: " + countVowel);
//This prints the positions of vowels
System.out.print("\nThe positions of all vowels in the string: "+vowelPosition);
}
}
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