你可以通過以下代碼實現C++矩陣的轉置：

#include <iostream>

const int rows = 3;
const int cols = 3;

void transposeMatrix(int matrix[rows][cols], int result[cols][rows]) {
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            result[j][i] = matrix[i][j];
        }
    }
}

int main() {
    int matrix[rows][cols] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
    int result[cols][rows];

    transposeMatrix(matrix, result);

    std::cout << "Original Matrix:" << std::endl;
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            std::cout << matrix[i][j] << " ";
        }
        std::cout << std::endl;
    }

    std::cout << "Transposed Matrix:" << std::endl;
    for (int i = 0; i < cols; i++) {
        for (int j = 0; j < rows; j++) {
            std::cout << result[i][j] << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}

在上面的代碼中，transposeMatrix函數用于計算矩陣的轉置，并將結果存儲在result數組中。在main函數中，我們定義了一個3x3的矩陣matrix，并調用transposeMatrix函數來計算轉置矩陣，并輸出原始矩陣和轉置矩陣。