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- // 2020/4/18(土)
- import java.util.Scanner;
- public class Gyoretsu3 {
- public static void main(String[] args) {
- Scanner scanner = new Scanner(System.in);
- System.out.println("2つの行列の積を求めます");
- System.out.println("1つめの行列の大きさ(行)を入力して下さい");
- int A_line = scanner.nextInt();
- System.out.println("1つめの行列の大きさ(列)を入力して下さい");
- int A_row = scanner.nextInt();
- System.out.println("2つめの行列の大きさ(行)を入力して下さい");
- int B_line = scanner.nextInt();
- System.out.println("2つめの行列の大きさ(列)を入力して下さい");
- int B_row = scanner.nextInt();
- if (A_row != B_line) {
- System.out.println("この2つの行列は(少なくともこの順では)積が求められません 終了します");
- return;
- }
- double[][] A = new double[A_line][A_row];
- double[][] B = new double[B_line][B_row];
- double[][] P = new double[A_line][B_row];
- for (int i = 0; i < A_line; i++) {
- for (int j = 0; j < A_row; j++) {
- System.out.println("1つめの行列の" + (i + 1) + "行" + (j + 1) + "列の要素の値を入力して下さい(小数可)");
- A[i][j] = scanner.nextDouble();
- }
- }
- for (int i = 0; i < B_line; i++) {
- for (int j = 0; j < B_row; j++) {
- System.out.println("2つめの行列の" + (i + 1) + "行" + (j + 1) + "列の要素の値を入力して下さい(小数可)");
- B[i][j] = scanner.nextDouble();
- }
- }
- for (int i = 0; i < A_line; i++) {
- for (int j = 0; j < B_row; j++) {
- for (int k = 0; k < A_row /* B_lineでも同じ */ ; k++) {
- P[i][j] += A[i][k] * B[k][j];
- }
- System.out.println("求める積を表す行列の" + (i + 1) + "行" + (j + 1) + "列の要素の値は、" + P[i][j] + "です");
- }
- }
- }
- }
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