Hi. Iīm kinda new to the pointer and multidimensional arrays. I need an input for the number and dimensions of an array. Than scan these and, sort the vectors and print them again. Only, every time I run the programm, it gets stuck and stops.

Hereīs my code

Iīve been stuck on this for quite a while. Thanks in advance!Code:#include <stdio.h> #include <stdlib.h> #include <math.h> void swap (double **p, double **q); /* wissel de pointer waardes om */ double length (double v[], int dim); /* bepaal de lengtes van de vectoren */ int main (void) { static int dim, num; int i, j; double **w, *v; scanf ("%d %d", &dim, &num); /* read N and M */ w = calloc (num, sizeof (double *)); /* allocate array of M pointers */ v = calloc (num, sizeof (double )); for (i = 0; i < num; i++) { /* allocate space for N dimensional vector */ w[i] = calloc (dim, sizeof (double)); /* read the vector */ for (j = 0; j < dim; j++) { scanf ("%le", &w[i][j]); } } for (i = 0; i < num; i++){ v[i] = length(w[i], dim); } /* acces the lengths and swap length and w vector in order*/ for (i = 0; i < num - 1; ++i){ for (j = num - 1; j > i; --j){ if (v[j-1] > v[j]) { swap(&w[j-1], &w[j]); } } } for (i = 0; i < num; ++i){ for(j = 0; j < dim; ++j){ printf("%le", w[i][j]); } } return 0; } void swap(double **p, double **q) { double *tmp = 0; *tmp = **p; **p = **q; **q = *tmp; } double length (double v[], int dim) { int i; double wl = 0.0; for (i = 0; i < dim; ++i) { wl += ((v[i]) * (v[i])); } wl = sqrt(wl); return wl; }