Java 11
import java.io.*;
import java.util.StringTokenizer;
public class Main {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
int s = Integer.parseInt(br.readLine());
int a;
int b;
StringTokenizer st;
for (int i=1; i<=s; i++) {
st = new StringTokenizer(br.readLine(), " ");
a = Integer.parseInt(st.nextToken());
b = Integer.parseInt(st.nextToken());
bw.write("Case #"+i+": ");
bw.write(a+" + "+b+" = ");
bw.write((a+b)+"\n");
}
br.close();
bw.flush();
bw.close();
}
}