# C++ 程序：使用多維數組相加兩個矩陣 > 原文： [https://www.programiz.com/cpp-programming/examples/add-matrix](https://www.programiz.com/cpp-programming/examples/add-matrix) #### 該程序采用`r * c`階的兩個矩陣并將其存儲在二維數組中。 然后，程序將這兩個矩陣相加并顯示在屏幕上。 要理解此示例，您應該了解以下 [C++ 編程](/cpp-programming "C++ tutorial")主題： * [C++ 多維數組](/cpp-programming/multidimensional-arrays) * [C++ 數組](/cpp-programming/arrays) * * * 在該程序中，要求用戶輸入行數`r`和列數`c`。 在此程序中，`r`和`c`的值應小于 100。 要求用戶輸入兩個矩陣的元素（`r * c`順序）。 然后，程序將這兩個矩陣相加，將其保存在另一個矩陣（二維數組）中并將其顯示在屏幕上。 ## 示例：使用多維數組相加兩個矩陣 ```cpp #include <iostream> using namespace std; int main() { int r, c, a[100][100], b[100][100], sum[100][100], i, j; cout << "Enter number of rows (between 1 and 100): "; cin >> r; cout << "Enter number of columns (between 1 and 100): "; cin >> c; cout << endl << "Enter elements of 1st matrix: " << endl; // Storing elements of first matrix entered by user. for(i = 0; i < r; ++i) for(j = 0; j < c; ++j) { cout << "Enter element a" << i + 1 << j + 1 << " : "; cin >> a[i][j]; } // Storing elements of second matrix entered by user. cout << endl << "Enter elements of 2nd matrix: " << endl; for(i = 0; i < r; ++i) for(j = 0; j < c; ++j) { cout << "Enter element b" << i + 1 << j + 1 << " : "; cin >> b[i][j]; } // Adding Two matrices for(i = 0; i < r; ++i) for(j = 0; j < c; ++j) sum[i][j] = a[i][j] + b[i][j]; // Displaying the resultant sum matrix. cout << endl << "Sum of two matrix is: " << endl; for(i = 0; i < r; ++i) for(j = 0; j < c; ++j) { cout << sum[i][j] << " "; if(j == c - 1) cout << endl; } return 0; } ``` **輸出** ```cpp Enter number of rows (between 1 and 100): 2 Enter number of columns (between 1 and 100): 2 Enter elements of 1st matrix: Enter element a11: -4 Enter element a12: 5 Enter element a21: 6 Enter element a22: 8 Enter elements of 2nd matrix: Enter element b11: 3 Enter element b12: -9 Enter element b21: 7 Enter element b22: 2 Sum of two matrix is: -1 -4 13 10 ```