利用指针计算两个矩阵的和

假设有两个矩阵A和B，它们的行数和列数均相等，我们可以使用指针计算它们的和。具体步骤如下：

1. 定义两个指向矩阵的指针A_ptr和B_ptr，以及一个指向结果矩阵的指针C_ptr。
2. 使用动态内存分配函数分别为A、B、C分配内存。
3. 使用两层循环遍历矩阵A和B的每个元素，将它们的和存储到矩阵C中。
4. 最后，释放分配的内存。

下面是代码示例：

#include <iostream>
using namespace std;

int main() {
    int rows, cols;
    cout << "Enter the number of rows and columns for the matrices: ";
    cin >> rows >> cols;

    // Allocate memory for matrices
    int** A = new int*[rows];
    int** B = new int*[rows];
    int** C = new int*[rows];
    for (int i = 0; i < rows; i++) {
        A[i] = new int[cols];
        B[i] = new int[cols];
        C[i] = new int[cols];
    }

    // Input values for matrices A and B
    cout << "Enter the values for matrix A: " << endl;
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            cin >> A[i][j];
        }
    }

    cout << "Enter the values for matrix B: " << endl;
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            cin >> B[i][j];
        }
    }

    // Calculate matrix sum
    int** A_ptr = A;
    int** B_ptr = B;
    int** C_ptr = C;
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            **C_ptr = **A_ptr + **B_ptr;  // Calculate sum
            A_ptr++;  // Move pointers to next element
            B_ptr++;
            C_ptr++;
        }
        A_ptr -= cols;  // Move pointers to next row
        B_ptr -= cols;
        C_ptr -= cols;
    }

    // Print result matrix
    cout << "Result matrix C = A + B:" << endl;
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            cout << C[i][j] << " ";
        }
        cout << endl;
    }

    // Deallocate memory for matrices
    for (int i = 0; i < rows; i++) {
        delete[] A[i];
        delete[] B[i];
        delete[] C[i];
    }
    delete[] A;
    delete[] B;
    delete[] C;

    return 0;
}