C++中動態申請與釋放二維數組

float** a;a= new float*[5]; for (j=0; j<5; j++){a[j] = new float[2];}float** a;a= new float*[5]; for (j=0; j<5; j++){a[j] = new float;}

for (i=0; i<5; i++){delete[] a[i];a[i]=NULL;}delete[] a;a=NULL;

a[0][0]=2;a[0][1]=4;a[1][0]=1.5;a[1][1]=6;a[2][0]=0.5;a[2][1]=3.5;a[3][0]=5;a[3][1]=7;a[4][0]=7.5;a[4][1]=9;

float** a;a= new float*[M]; for (j=0; j<M; j++){a[j] = new float[N];}

        for (i=0; i<M; i++){for (j=0; j<N; j++){a[i][j] = i*j;}}

for (i=0; i<M; i++){delete[] a[i];a[i]=NULL;}delete[] a;a=NULL;