How do I exit out from an if-statement in a for loop?-CodePudding

I want the program to run the if statement for the first iteration of the for loop, and then ignore it for the rest of the iterations. How do I do that? Continue and break didn't work either and led to a wacky output. The program is meant to take the first letter of each word in a string inputted and then form a word with those letters.

import java.util.Scanner;
class First_letter
{
    public static void main()
    {
        System.out.println("\f"); // clearing screen
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter a sentence");
        String s = sc.nextLine();
        String S = s.toUpperCase();
        String NS = "";
        char c = Character.MIN_VALUE;
        for (int i = 0; i < S.length(); i  )
        {
            if( i == 0 && Character.isLetter(S.charAt(0)))
            {
                NS = NS   S.charAt(0);
            }
            if (S.charAt(i) == ' ')
            {
                if (Character.isLetter(S.charAt(i 1)) == true)
                {
                    c = S.charAt(i);
                    NS = NS   c;
                }
            }
        }
        System.out.println("The word formed from the first letter of all the words in the sentence is " NS);
    }
}

CodePudding user response：

Assuming I understand your intent:

If you only want code to execute for the first loop iteration, there's no reason for that code to be in the loop.

    if (S.length() != 0 && Character.isLetter(S.charAt(0)))
    {
       NS = NS   S.charAt(0);
    }
    for (int i = 0; i < S.length(); i  )
    {
        if (S.charAt(i) == ' ')
        {
            if (Character.isLetter(S.charAt(i 1)) == true)
            {
                c = S.charAt(i);
                NS = NS   c;
            }
        }
    }

Note length check before accessing the 0'the character.

For clarity, the two 'ifs' inside the loop can be combined into one, using the '&&' logical operator, but I left that part unchanged.

CodePudding user response：

If I understand your questions correctly, you want to create a WORD from the first letter of every word in the sentence. If this is true then the following should solve it. Let's keep it simple.

Split the sentences into words.
Take the first char from every word.
Change it to upper case.
And finally, join the result of every word.

public static void main(String[] args) {
        System.out.println("\f"); // clearing screen
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter a sentence: ");
        System.out.println("The word formed from the first letter of all the words in the sentence is "
                  Joiner.on("")
                .join(Arrays.stream(sc.nextLine().split("\\s "))
                        .filter(StringUtils::isNotBlank)
                        .map(w -> w.charAt(0))
                        .map(Character::toUpperCase).toList()
                )
        );
}

CodePudding user response：

use break; or continue; keyword to get out of loop.
Break
The break statement is used to terminate the loop immediately.
Continue
The continue statement is used to skip the current iteration of the loop.