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Java Stdin and Stdout II
Java Stdin and Stdout II
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Java Code of my
A bit confused at first but now I know. Here's what's happening step by step:
import java.util.Scanner;
public class Solution {
}
import java.io.; import java.util.;
public class Solution {
} /*The Core Issue When you use Scanner to read input from the console, each call to a Scanner's method (like nextInt(), nextDouble(), or nextLine()) consumes input until it reaches a delimiter (by default, whitespace characters such as spaces, tabs, and newlines). After consuming the input, it leaves the delimiter in the input buffer.
Problem Scenario Consider the following scenario:
You read an integer using nextInt(). Then, you try to read a double using nextDouble(). Issue: Both nextInt() and nextDouble() leave a newline character (\n) in the input buffer. This happens because they stop reading input upon encountering a whitespace character, and the newline character is considered a delimiter.
Why scan.nextLine(); Is Necessary After attempting to read a double with nextDouble(), the input buffer contains a newline character. If you were to immediately try to read a string with nextLine(), it would encounter this newline character and interpret it as the end of the input, resulting in an empty string being returned.
However, if you insert scan.nextLine(); between nextDouble() and the next nextLine(), it consumes the leftover newline character in the buffer. This way, when nextLine() is called again, it correctly waits for the user to input a new line of text, allowing it to read the string as expected.
Summary The scan.nextLine(); call after reading an integer or a double is necessary because it consumes the leftover newline character in the input buffer, preventing it from interfering with the subsequent nextLine() call. Without this intermediate nextLine(); call, the nextLine(); call meant to read the string would immediately encounter the newline character left behind by nextInt() or nextDouble(), leading to an empty string being read. This pattern is a common workaround for handling input sequences involving integers, doubles, and strings in Java, ensuring that each piece of input is read correctly and in order. */
import java.util.Scanner;
public class Solution {
}