Question

编程求一个4x4数组的左下三角（包括主对角线）元素的和。

Answer 1

import java.util.Random;

public class PlanarArraySum {
public static void main(String[] args) {
int[][] planar = new int[4][4];
Random rnd = new Random();
System.out.println("二维数组：");
for (int i = 0; i < planar.length; i++) {
for (int j = 0; j < planar[i].length; j++) {
planar[i][j] = rnd.nextInt(100);
System.out.print(planar[i][j] < 10 ? " " + planar[i][j] : " " + planar[i][j]);
}
System.out.println();
}

int sum = 0;
int k = 0;
for (int i = planar.length - 1; i >= 0; i--) {
for (int j = k; j < planar[i].length; j++) {
sum += planar[i][j];
}
k++;
}
System.out.println("左下三角和：" + sum);
}
}

追问

C语言啊……

追答

。。。。。。。天天泡在Java里，你向我提问，我还以为你问的是Java，C语言的思路也一样，照着来就行。

追问

我不会写啊 入门选手 明天检查啊

追答

#include
void main()
{
int planar[4][4];
int i, j, sum = 0, k = 0;
printf("二维数组：\n");
for (i = 0; i = 0; i--)
{
for (j = k; j < sizeof(planar[i]) / sizeof(planar[i][0]); j++)
{
sum += planar[i][j];
}
k++;
}
printf("左下三角和：%d\n", sum);;
system( "PAUSE ");
}