Question

1. Write a Java program to count the letters, spaces, numbers and other characters of an input string.
2. Write a Java program to print numbers between 1 to 100 which are divisible by 3, 5 and by both
3. Write a Java program to convert a given string into lowercase

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
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1)

// CountChars.java

import java.util.Scanner;

public class CountChars {

   public static void main(String[] args) {
       /*
       * Declaring variables
       */
       int cntLetters = 0, cntSpaces = 0, cntNumbers = 0, cntOtherChars = 0;
       String str = "";
       char ch;
       /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner sc = new Scanner(System.in);

       // Getting the input entered by the user
       System.out.print("Enter String :");
       str = sc.nextLine();

       for (int i = 0; i < str.length(); i++) {
           ch = str.charAt(i);
           if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) {
               // Counting no of letters
               cntLetters++;
           } else if (ch >= '0' && ch <= '9') {
               // counting no of digits
               cntNumbers++;
           } else if (ch == ' ') {
               // Counting no of letters
               cntSpaces++;
           } else {
               // counting no of special chars
               cntOtherChars++;
           }

       }

       // Displaying the output
       System.out.println("No of Letters :" + cntLetters);
       System.out.println("No of Digits :" + cntNumbers);
       System.out.println("No of Spaces :" + cntSpaces);
       System.out.println("No of Other characters :" + cntOtherChars);

   }

}

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Output:

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2)

// PrintNosDivisibleBy3Or5OrBoth.java

public class PrintNosDivisibleBy3Or5OrBoth {

   public static void main(String[] args) {
       int cnt=0;
       // Displaying the numbers which are divisible by 3 or 5 or both
       for (int i = 1; i <= 100; i++) {
           if ((i % 3 == 0) || (i % 5 == 0) || ((i % 3 == 0) && (i % 5 == 0))) {
               cnt++;
               System.out.printf("%5d",i);
               if(cnt%10==0)
               {
                   System.out.println();  
               }
              
           }
       }
   }

}

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Output:

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3)

// ConvertUpperToLower.java

import java.util.Scanner;

public class ConvertUpperToLower {

   public static void main(String[] args) {

       /*
       * Declaring variables
       */
       String str = "", newStr = "";
       char ch;
       /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner sc = new Scanner(System.in);

       // Getting the input entered by the user
       System.out.print("Enter String :");
       str = sc.nextLine();

       for (int i = 0; i < str.length(); i++) {
           ch = str.charAt(i);
           if (ch >= 'A' && ch <= 'Z') {
               ch = (char) (((int) ch) + 32);
               newStr += ch;
           } else {
               newStr += ch;
           }
       }

       System.out.println("After Converting to lowercase :" + newStr);
   }

}

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Output:

=====================Could you plz rate me well.Thank You