练习3：将矩阵的行列之和分别存入两个数组

 1 #include<iostream>
 2 using namespace std;
 3 
 4 int main()
 5 {
 6     int i, j;
 7     int A[5][5] = { 23, 45, 6, 1, -3,
 8         4, 5, 233, 456, 0,
 9         3, 56, 78, -356, 5,
10         6, 777, 8, 89, 9,
11         3, 6, 8, 9, 90 };
12 
13     int B[5] = { 0 };
14     int C[5] = { 0 };
15 
16     for (i = 0; i < 5; i++)
17     {
18         for (j = 0; j < 5; j++)
19         {
20             B[i] = A[i][j] + B[i];//每次内循环可以将行和计算出来
21             C[j] = A[i][j] + C[j];//每次内循环，将每行依次填入C数组，然后靠外循环每次在相应位置加上去，就得到了列之和
22         }
23     }
24 
25     for (i = 0; i < 5; i++)
26     {
27         for (j = 0; j < 5; j++)
28         {
29             cout << A[i][j] << "    ";
30         }
31         cout << B[i];
32         cout << endl;
33     }
34     for (i = 0; i < 5; i++)
35     {
36         cout << C[i] << "    ";
37     }
38     cout << endl;
39     return 0;
40 }