我写了这段代码。
public static void main(String[] args) {
Scanner console = new Scanner(System.in);
System.out.println("Please enter the rows \"then\" columns of the first array: ");
int a = console.nextInt();
int b = console.nextInt();
int[][] arr1 = new int[a][b];
System.out.println("Please enter the rows \"then\" columns of the second array: ");
int c = console.nextInt();
int d = console.nextInt();
int[][] arr2 = new int[c][d];
if (b != c) {
System.out.println("these two matrices can't be multiplied!!");
} else {
int[][] mult = new int[a][c];
System.out.println("Please enter the elements of the first array : ");
for (int i = 0; i < a; i++) {
for (int j = 0; j < b; j++) {
arr1[i][j] = console.nextInt();
}
}
System.out.println("Please enter the elements of the second array : ");
for (int i = 0; i < c; i++) {
for (int j = 0; j < d; j++) {
arr2[i][j] = console.nextInt();
}
}
int sum = 0;
for (int i = 0; i < a; i++) {
for (int j = 0; j < d; j++) {
for (int k = 0; k < c; k++) {
sum += arr1[i][k] * arr2[k][j];
mult[i][j] = sum;
}
sum = 0;
}
}
for(int i=0;i<a;i++){
for(int j=0;j<d;j++) {
System.out.print(mult[i][j] + " ");
}
System.out.println("");
}
}
}
}
当我运行它时,它显示为java.lang.ArrayIndexOutOfBoundsException
。
我不知道为什么,谢谢您的帮助。
答案 0 :(得分:0)
据我所知,这可能是问题所在:int[][] mult = new int[a][c]
,应该是new int[a][d]
P / s:如果您可以格式化代码的第一部分,那就更好了