我如何初始化双指针有什么问题？

Question

When I run my program just hangs. Is there anything wrong with the my double pointer setup? If I comment this out my program doesnt hang.

double **transverse;
transverse = malloc(rows*sizeof(double*));  //allocate memory to double pointer
for (i = 0; i < rows; i++)
{
    transverse[i] = malloc(rows*sizeof(double*));
    for (j = 0; j < rows; j++)
        transverse[i][j] = 0;
}

Answer 1

Your second allocation is wrong

transverse[i] = malloc(rows*sizeof(double*));

It should be

transverse[i] = (double*)malloc(rows*sizeof(double));

traverse[i] is a double * , therefore, you need to use sizeof(double) .

Answer 2

for (i = 0; i < rows; i++)
{
    //Just double for allocating memory for double pointer transverse[i]
    transverse[i] = malloc(rows*sizeof(double));  //<-- remove double*
    for (j = 0; j < rows; j++)
        transverse[i][j] = 0;
}