A+B: Difference between revisions
→{{header|Java}}
No edit summary |
|||
Line 3,254:
=={{header|Java}}==
The task description is somewhat vague, if the 'input stream' is in reference to the data provided at the command line, then Java will parse these values into a ''String'' array, accessible via the 'args' parameter of the ''main'' method.
<syntaxhighlight lang="java">
public static void main(String[] args) {
int A = Integer.parseInt(args[0]);
int B = Integer.parseInt(args[1]);
System.out.println(A + B);
}
</syntaxhighlight>
If the 'input stream' is the standard-in, you can use the following.<br />
The ''Scanner'' class can be used to "scan" the standard-in stream from left to right, returning the next value requested.
<syntaxhighlight lang="java">
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int A = scanner.nextInt();
int B = scanner.nextInt();
System.out.println(A + B);
}
</syntaxhighlight>
If the 'input stream' is referring to any abstraction, then you can use the following.<br />
In this example, the data is considered to be under a specific charset, so the integer values are parsed using UTF-8.
<syntaxhighlight lang="java">
import static java.nio.charset.StandardCharsets.UTF_8;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
</syntaxhighlight>
<syntaxhighlight lang="java">
int sum(InputStream input) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
String line = reader.readLine();
reader.close();
/* split parameter here is a regex */
String[] values = line.split(" +");
int A = Integer.parseInt(values[0]);
int B = Integer.parseInt(values[1]);
return A + B;
}
</syntaxhighlight>
<br />
An alternate implemenation
<syntaxhighlight lang="java">import java.util.Scanner;
| |||