Dynamic array in C/C++

Two dim float malloc
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    float ** PC;

    PC = (float**) malloc(DIM_PC_X * sizeof(float*)); // [DIM_PC_X][DIM_PC_Y];
    for(int i = 0; i < DIM_PC_X; i++)
        PC[i] = (float*) malloc(DIM_PC_Y * sizeof(float));



Two dim float using new
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int sizeX=5,sizeY = 2;
   
int** ary = new int*[sizeX];
   
for(int i = 0; i < sizeX; ++i)
       
    ary[i] = new int[sizeY];