C++定义一个m行n列的矩阵类

class matrix{public:matrix():r(0),p(0),j(NULL) {}matrix(int m,int n):r(m),p(n){j = new int*[m];for(int i = 0; i < m; i++){j[i] = new int[n];}}matrix(){for(int i = 0; i < r; i++){delete[] j[i];}delete[] j;}matrix(matrix& a) :r(a。r),p(a。p){j = new int*[r];for(int i = 0; i < r; i++){j[i] = new int[p];for(int k = 0; k < p; k++){j[i][k] = a。j[i][k];}}}private:int** j;const int r;const int p;};