Dynamic memory

[Binarydepth via Digitalmars-d-learn]

Here is what I'm trying to do :

import std.stdio : readf, writef;
void main()	{
	int[2][] nam;
	int num;
	readf(" %d", &num);
	nam.length = num;
	foreach(nim; 0..num)	{
		readf(" %d %d", &nam[0][num], &nam[1][num]);
	}
	foreach(nim; 0..num)	{
		writef(" %d %d\n", &nam[0][num], &nam[1][num]);
	}
}

And here is the output I get when running the program :

core.exception.RangeError at code.d(8): Range violation
----------------
0x406cfb _Dmain
	???:0
0x415fde void rt.dmain2._d_run_main(int, char**, extern (C) int 
function(char[][])*).runAll().void __lambda1()
	../../../../src/libphobos/libdruntime/rt/dmain2.d:408
0x41624e void rt.dmain2._d_run_main(int, char**, extern (C) int 
function(char[][])*).tryExec(scope void delegate())
	../../../../src/libphobos/libdruntime/rt/dmain2.d:383
0x4164a8 void rt.dmain2._d_run_main(int, char**, extern (C) int 
function(char[][])*).runAll()
	../../../../src/libphobos/libdruntime/rt/dmain2.d:408
0x41624e void rt.dmain2._d_run_main(int, char**, extern (C) int 
function(char[][])*).tryExec(scope void delegate())
	../../../../src/libphobos/libdruntime/rt/dmain2.d:383
0x4163d5 _d_run_main
	../../../../src/libphobos/libdruntime/rt/dmain2.d:416
0x7f51eb84ea3f __libc_start_main
	???:0
0x406088 _start
	???:0
0xffffffffffffffff ???
	???:0
----------------------------------------------------------------------------------

I just want to read and print data depending on user input.