public static Matrix scanMatrix() { // 输入矩阵
int i, j;
Matrix matrix = new Matrix();
Scanner scanner = new Scanner(System.in);
matrix.setLine(scanner.nextInt());
matrix.setRow(scanner.nextInt());
matrix.setAccuracy(scanner.nextDouble());
for (i = 0; i < matrix.getLine(); i++) {
for (j = 0; j < matrix.getRow(); j++) matrix.setElement(i, j, scanner.nextDouble());
}
return matrix;
}
public static void main(String[] args) {
int i = 4;
double d = 4.0;
String s = "HackerRank ";
Scanner scan = new Scanner(System.in);
/* Declare second integer, double, and String variables. */
int j;
double e;
String t;
/* Read and save an integer, double, and String to your variables.*/
j = scan.nextInt();
e = scan.nextDouble();
scan.nextLine();
t = scan.nextLine();
/* Print the sum of both integer variables on a new line. */
System.out.println(i + j);
/* Print the sum of the double variables on a new line. */
System.out.println(d + e);
/* Concatenate and print the String variables on a new line;
the 's' variable above should be printed first. */
System.out.println(s + t);
scan.close();
}