Java program to toggle each character in a string
Toggle each character in a String
In this java program we’re going to make a program to toggle each character in a String , First we will take String input from user .
If the letter is in uppercase we will convert it to lowercase and if it is in uppercase we will convert it to lowercase.
Algorithm
- Take String input from user and store in the variable “s” (in this case)
- Take another String variable s1 (in this case)
- Take a for loop i start from i=0 to i<s.length
- Take if part get one by one character from String using charAt() method and and check whether is it upper case using isUpperCase() and change upper case character to lower case and store it in s
- In else part change the variable from lower case to upper case and store it in s variable
Code in Java
Run
import java.util.Scanner; public class Main { public static void main(String[] args) { String s = "PrePInsTa"; String s1 = ""; for (int i = 0; i < s.length(); i++) { if(Character.isUpperCase(s.charAt(i))) s1=s1+Character.toLowerCase(s.charAt(i)); else s1=s1+Character.toUpperCase(s.charAt(i)); } System.out.println("Toggle String is : "+s1); } }
Output
Enter a String : PrePInsTa Toggle String is : pREpiNStA
Method 2
The Logic is same here we are using the ASCII value
- Initialize the variables.
- Initiate a for loop.
- Toggle each character.
- Terminate the loop.
- Print toggled string.
Run
public class Main {
public static void main(String[] args) {
String str1 = "PrepInsta";
char str[] = str1.toCharArray();
for (int i = 0; i < str1.length(); i++) { if (str[i] >= 'A' && str[i] <= 'Z') str[i] = (char)(str[i] + 'a' - 'A'); else if (str[i] >= 'a' && str[i] <= 'z')
str[i]= (char)(str[i] + 'A' - 'a');
}
System.out.println("Toggled string: ");
for (int i = 0; i < str1.length(); i++) {
System.out.print(str[i]);
}
}
}
Toggled string: pREPiNSTA
Method 3
This program is the same as above, but this time we are using the While Loop.
Run
public class Main {
public static void main(String[] args) {
String str1 = "PrepInsta";
char str[] = str1.toCharArray();
int i = 0;
while (i < str1.length()) {
if (str[i] >= 'a' && str[i] <= 'z') {
str[i] = (char)(str[i] + 'A' - 'a');
}
else if (str[i] >= 'A' && str[i] <= 'Z') {
str[i] = (char)(str[i] + 'a' - 'A');
}
i++;
}
System.out.println("Toggled string: ");
for (i = 0; i < str1.length(); i++) {
System.out.print(str[i]);
}
}
}
Output
Toggled string: pREPiNSTA
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import java.util.*;
public class Main
{
public static void main(String[] args) {
System.out.println(“enter the char”);
Scanner sc = new Scanner(System.in);
String st ;
st = sc.nextLine();
for(int i=0;i=97 && st.charAt(i)=65 && st.charAt(i)<=90){
char c = (char) (currentChar + 32);
System.out.print(c);
}
}
String euu="shivakesava";
System.out.println(euu.toUpperCase());
}
}
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import java.util.*;
class HelloWorld {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
String s=sc.nextLine();
String str=””;
for(int i=0;i<s.length();i++){
if(Character.isUpperCase(s.charAt(i))){
str+=Character.toLowerCase(s.charAt(i));
}
else{
str+=Character.toUpperCase(s.charAt(i));
}
}
System.out.print(str);
}
}
Identify the error(s) in the code given and rectify so that the program accepts a string as the input and prints the same.
import java.util.Scanner;
public class Hello {
public static void main(String[ ] args) {
Scanner sc = new Scanner(System.in);
char str = sc.nextChar();
System.out.println(“%s”,str);
}
}
Join our Discord channel for technical queries.
import java.util.*;
public class Main
{
public static void main (String[]args)
{
String str=”Gyanendra Tiwari”;
System.out.println(find(str));
}
public static StringBuffer find(String str){
StringBuffer ans=new StringBuffer();
for(int i=0;i=’A’ && ch=’a’ && ch<='z'){
int val=(int)str.charAt(i) – 32;
ch=(char)val;
}
ans.append(ch);
}
return ans;
}
}
class HelloWorld {
public static void main(String[] args) {
String str=”geek for geeks”;
String str1[]=str.split(” “);
String temp=””;
for(String s:str1){
char ch[] = s.toCharArray();
for(int j=0;j<ch.length;j++){
if(j==0 || j==(ch.length-1)){
ch[j]=(char)(ch[j]+'A'-'a');
}
else{
continue;
}
}
temp=temp+String.valueOf(ch)+" ";
}
System.out.println(temp);
}
}
class HelloWorld {
public static void main(String[] args) {
String str=”geek for geeks”;
String str1[]=str.split(” “);
String temp=””;
for(String s:str1){
char ch[] = s.toCharArray();
//System.out.println(String.valueOf(ch));
for(int j=0;j<ch.length;j++){
if(j==0 || j==(ch.length-1)){
ch[j]=(char)(ch[j]+'A'-'a');
}
else{
continue;
}
}
temp=temp+String.valueOf(ch)+" ";
}
System.out.println(temp);
}
}
import java.util.Scanner;
public class Toggle {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
System.out.println(“Enter the String: “);
String s = sc.nextLine();
String s1 = ” “;
for (int i = 0; i < s.length(); i++) {
char ch = s.charAt(i);
if (Character.isUpperCase(ch)) {
s1 = s1 + Character.toLowerCase(ch);
} else {
s1 = s1 + Character.toUpperCase(ch);
}
}
System.out.println("Toggle string is : " + s1);
}
StringBuilder str1 = new StringBuilder(str);
for (int i = 0; i = ‘a’ && ch =’A’ && ch<='Z') {
char lws = (char) (ch + 'a' – 'A');
str1.setCharAt(i, lws);
}
}
StringBuilder str1 = new StringBuilder(str);
for (int i = 0; i = ‘a’ && ch =’A’ && ch<='Z') {
char lws = (char) (ch + 'a' – 'A');
str1.setCharAt(i, lws);
}
}
System.out.print(str1);
}
}
package stringprogram;
import java.util.Scanner;
public class TogglingEachCharacter {
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
System.out.println(“Enter String “);
String Str1 = sc.next();
String Str2=””;
for(int i = 0;i =65 && (int)Str1.charAt(i)<=91){
Str2=Str2+Str1.toLowerCase().charAt(i);
}
else {
Str2=Str2+Str1.toUpperCase().charAt(i);
}
}
System.out.println("Toggle string is "+Str2);
}
}
package stringprogram;
import java.util.Scanner;
public class TogglingEachCharacter {
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
System.out.println(“Enter String “);
String Str1 = sc.next();
String Str2=””;
for(int i = 0;i =65 && (int)Str1.charAt(i)<=91)
Str2=Str2+Str1.toLowerCase().charAt(i);
else
Str2=Str2+Str1.toUpperCase().charAt(i);
}
System.out.println("Toggle string is "+Str2);
}
}
Thank you prepinsta for publishing my code…