題目描述
輸入兩個正整數m和n,然后輸入該m行n列矩陣的元素值，請分別計算該矩陣各行元素的和。
輸入
兩個正整數m和n(1≤m≤10、1≤n≤10)
輸出
m行n列矩陣各行元素的和
樣例輸入
3 2
1 4 8 2 6 5
樣例輸出
5
10
11
代碼如下
import java.util.Random;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
int[][] aa = {{1,2,3},{4,5,6,7},{8,9,10}};
System.out.println(aa.length);
System.out.println(aa[1].length);
int[][] cc = new int[3][];
cc[0] = new int[3];
cc[1] = new int[5];
cc[2] = new int[7];
int m, n, i, j, sum;
Random rd = new Random();
Scanner sc = new Scanner(System.in);
while(sc.hasNext()) {
m = sc.nextInt();
n = sc.nextInt();
aa = new int[m][n];
for(i = 0; i < m; i++) {
for(j = 0; j < n; j++) {
aa[i][j] = rd.nextInt(30);
System.out.printf("%3d", aa[i][j]);
}
System.out.println();
}
for (i = 0; i < m; i++) {
sum = 0;
for (j = 0; j < n; j++)
sum += aa[i][j];
System.out.println("第" + i + "行的和是：" + sum);
}
for (j = 0; j < n; j++) {
sum = 0;
for (i = 0; i < m; i++)
sum += aa[i][j];
System.out.println("第" + j + "列的和是：" + sum);
}
}
sc.close();
}
}
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標籤：應用實例
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