Pointers to struct

What is wrong here ? void Init(int **arr, int sz_n,int sz_m){ int j,k; arr = (int **) malloc(sz_n*sizeof(int *)); for (j=0;j<sz_n;j++) { arr[j]= (int *)malloc(sz_m*sizeof(int)); for (k=0;k<sz_m;k++) arr[j][k]=0; }}main(){ int ** a; Init(a,10,5); printf(“ entry[3][3] is %d\n”,a[3][3]);}

What is wrong here ? void Init(int **arr, int sz_n,int sz_m) { int j,k; arr = (int **) malloc(sz_n*sizeof(int *)); for (j=0;j<sz_n;j++) { arr[j]= (int *)malloc(sz_m*sizeof(int)); for (k=0;k<sz_m;k++) arr[j][k]=0; } } main() { int ** a; Init(a,10,5); printf(“ entry[3][3] is %d\n”,a[3][3]); }