how can i use pointer like C pointer？

i have a think ,i hope use pointer like C ,following is c code:

.........
char * data;
int *iptr;
float* fptr;
double * dbptr;

data = new char[100*4];
iptr = (int *)&data[0];
fptr = (float *)&data[0];
dbptr = (double *)&data[0];

i not't kown how can code this use fortran pointer？

please tell me answer, thanks.