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  1. #include <stdio.h>
  2. int main() 
  3. {
  4.     int matrix[3][3], i, j, sum = 0;
  5.     printf("请输入 3x3 矩阵的元素：\n");
  6.     for (i = 0; i < 3; i++) 
  7.     {
  8.         for (j = 0; j < 3; j++) 
  9.         {
  10.             scanf("%d", &matrix[i][j]);
  11.         }
  12.     }
  13.     for (i = 0; i < 3; i++) 
  14.     {
  15.         for (j = 0; j < 3; j++) 
  16.         {
  17.             if (i == j || i + j == 2) 
  18.             { 
  19.                 sum += matrix[i][j];
  20.             }
  21.         }
  22.     }
  23.     printf("对角线元素之和为：%d\n", sum);
  24.     return 0;
  25. }
Success #stdin #stdout 0s 5296KB
comments (?)
stdin 
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stdout 
请输入 3x3 矩阵的元素：
对角线元素之和为：24
https://ideone.com/4jUxxn
language:
C (gcc 8.3)
created:
12 days ago
visibility:
public

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