云计算开发：Python练习实例-求对角线元素之和-凿隧入井网

云计算开发：Python练习实例-求对角线元素之和

发布日期：2026-11-14

浏览次数：{固定数字3}

题目：求一个3*3矩阵主对角线元素之和。

程序分析：利用双重for循环控制输入二维数组，再将a[i][i]累加后输出。

程序源代码：

以上实例输出结果为：

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