I Am Neo Java Week 7

 

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Skill builder

1. Write a program to check whether the string is lexicographically equal to another string

import java.util.Scanner; class Main{ public static void main(String args[]) { Scanner in=new Scanner(System.in); String str1,str2; str1=in.nextLine(); str2=in.nextLine(); int result = str1.compareTo( str2 ); System.out.println(result); } }

2. Write a program to remove all the spaces in the given sentence.

import java.util.Scanner; class Main { public static void main(String[] args){ Scanner in=new Scanner(System.in); String str ; str=in.nextLine(); str = str.replaceAll(" ", ""); System.out.println(str); } }

3. Write a program to check whether the given string is a palindrome.

import java.util.*; import java.util.Scanner; class Main { public static void main(String args[]) { String str, reverse = ""; Scanner in = new Scanner(System.in); str = in.nextLine(); int length = str.length(); for (int i = length - 1; i >= 0; i--) reverse = reverse + str.charAt(i); if (str.equals(reverse)) System.out.println(str+" :palindrome"); else System.out.println(str+" :not a palindrome"); } }

4. Write a program to find the smallest and largest word in the given string.

import java.util.Scanner; class Main { public static void main(String[] args){ String string ; Scanner in=new Scanner(System.in); string=in.nextLine(); String word = "", small = "", large=""; String[] words = new String[100]; int length = 0; string = string + " "; for(int i = 0; i < string.length(); i++){ if(string.charAt(i) != ' '){ word = word + string.charAt(i); } else{ words[length] = word; length++; word = ""; } } small = large = words[0]; for(int k = 0; k < length; k++){ if(small.length() > words[k].length()) small = words[k]; if(large.length() < words[k].length()) large = words[k]; } System.out.println("Smallest word: " + small); System.out.println("Largest word: " + large); } }

5. Write a program to count the vowels in the string.

import java.util.Scanner; class Vow{ public static void main(String[] args) { Scanner in = new Scanner(System.in); String str = in.nextLine(); System.out.print(count_Vowels(str)); } public static int count_Vowels(String str) { int count = 0; for (int i = 0; i < str.length(); i++) { if (str.charAt(i) == 'a' || str.charAt(i) == 'e' || str.charAt(i) == 'i' || str.charAt(i) == 'o' || str.charAt(i) == 'u') { count++; } } return count; } }

6. Write a program to find the starting index of a given character in the string.

import java.util.Scanner; class Main{ public static void main(String args[]) { String Str ; char c; Scanner in=new Scanner(System.in); Str=in.nextLine(); c=in.next().charAt(0); System.out.println(Str.indexOf( c )); } }

7. Write a program to display the middle value of the string

import java.util.Scanner; class Main{ public static void main(String[] args) { Scanner in = new Scanner(System.in); String str = in.nextLine(); System.out.print(middle(str)); } public static String middle(String str) { int position; int length; if (str.length() % 2 == 0) { position = str.length() / 2 - 1; length = 2; } else { position = str.length() / 2; length = 1; } return str.substring(position, position + length); } }

8. Write a program to count the number of words in a string.

import java.util.Scanner; class Main { public static void main(String args[]) { String s; Scanner in=new Scanner(System.in); s=in.nextLine(); char ch[]=s.toCharArray(); int count = 1; for (int i = 0; i < s.length() - 1; i++) { if ((s.charAt(i) == ' ') && (s.charAt(i + 1) != ' ')) { count++; } } System.out.println(count); } }

9. South India is divided into 4 big kingdoms and ruled by great kings chola,chera,pallava,pandiya.

import java.io.*; import java.util.*; class student { String name; int x; int y; String co; student() { name = ""; x = 0; y = 0; } }; class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); student ob[] = new student[1000]; List<String> chola = new ArrayList<String>(); List<String> chera = new ArrayList<String>(); List<String> pallava = new ArrayList<String>(); List<String> pandya = new ArrayList<String>(); List<String> renounce = new ArrayList<String>(); int n = sc.nextInt(); for(int i=0;i<n;i++) { ob[i] = new student(); ob[i].name = sc.next(); ob[i].x = sc.nextInt(); ob[i].y = sc.nextInt(); } for(int i=0;i<n;i++) { if (ob[i].x > 0 && ob[i].y > 0) chola.add(ob[i].name); else if (ob[i].x < 0 && ob[i].y > 0) chera.add(ob[i].name); else if (ob[i].x < 0 && ob[i].y < 0) pallava.add(ob[i].name); else if (ob[i].x > 0 && ob[i].y < 0) pandya.add(ob[i].name); else renounce.add(ob[i].name); } System.out.println("chola"); System.out.println(chola); System.out.println("chera"); System.out.println(chera); System.out.println("pallava"); System.out.println(pallava); System.out.println("pandya"); System.out.println(pandya); System.out.println("renounce"); System.out.println(renounce); } }

10. Consider a fleet of soldiers of a country are being assembled for a rehearsal session

public static String defeatSoldiers(String soldiers, String pattern) { while (soldiers.length() > 0) { int idx = soldiers.indexOf(pattern); if (idx == -1) { break; } soldiers = soldiers.replaceFirst(pattern, ""); } return soldiers; }

Challange Yourself

1. Vijay is working

import java.util.Scanner; class CapitalizeFirstLetter { public static void main(String[] args) { // System.out.println("Enter the sentence to capitalize the first letter : "); Scanner scanner = new Scanner(System.in); String string = scanner.nextLine(); Scanner stringScanner = new Scanner(string); String resultString = ""; while (stringScanner.hasNext()) { String str = stringScanner.next(); resultString = resultString + str.substring(0, 1).toUpperCase() + str.substring(1) + " "; } System.out.println(resultString); } }

2. John and Michael

import java.util.Scanner; class WordsArrange { public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n=sc.nextInt(); int i,j; n=n+1; String[] array= new String[n]; String s; for(i=0;i<n;i++) { array[i] =sc.nextLine(); } for(i=0;i<n;i++) { for(j=i;j<n;j++) { if(array[i].length()>array[j].length()) { s=array[i]; array[i]=array[j]; array[j]=s; } } } for(i=0;i<n;i++) { System.out.print(array[i]+" "); } sc.close(); } }

3. Write a program to remove consecutive vowels from a string

import java.util.Scanner; class Main { static boolean is_vow(char c) { return (c == 'a') || (c == 'e') || (c == 'i') || (c == 'o') || (c == 'u'); } static void removeVowels(String str) { System.out.print(str.charAt(0)); for (int i = 1;i < str.length(); i++) if ((!is_vow(str.charAt(i - 1))) || (!is_vow(str.charAt(i)))) System.out.print(str.charAt(i)); } public static void main(String[] args) { String str; Scanner in=new Scanner(System.in); str=in.nextLine(); removeVowels(str); } }

4. Imagine you are working as support staff in Amusement park.

import java.util.*; import java.io.*; class Main { public static void main(String []args) { Scanner in =new Scanner(System.in); in.nextLine(); String inputString = in.nextLine(); char [] str = inputString.toCharArray(); System.out.print(str[0]); for (int i=1; i<str.length ; i++) { if (str[i] != ' ') { if ((str[i] == str[i-1]+1) || (str[i] == str[i-1]-1)) { System.out.print(str[i]); } else { System.out.print("\n" + str[i]); } } } } }

5. Caption Contest

import java.io.*; import java.util.*; class CaptionContest { public static void main(String [] args) { int i,min=0,max=0; String str1,str2; Scanner sc = new Scanner(System.in); str1 = sc.next(); str2 = sc.next(); for(i=0;i<str1.length();i++) { if(str1.charAt(i)!=str2.charAt(i)) { if((str1.charAt(i)!=63)&&(str2.charAt(i)!=63)) { min++; max++; } else { max++; } } else if((str1.charAt(i)==str2.charAt(i))&&(str1.charAt(i)==63)) { max++; } } System.out.print(min+" "+max); } }