add example of initializing an array without literal

There was no example on how to initialize an array except for using a literal. For large arrays, initialization using a literal is not really an option.
Update input.md

Fixed broken link.
Merge pull request #257 from yen223/patch-1

Fixed broken link in Try! page
hof: Removed unnecessary "if" in is_odd() definition.
Merge pull request #258 from orium/is_odd-minor

Removed unnecessary "if" in is_odd() definition.
fixed comment for example one

I believe Rust now infers the lifetime for the case described in the first example.
calling first example in main function
fixed Mul trait implementation for Vec2<T>

* added missing trait and struct name for Mul trait implementation
* use of current function name (mul instead of dot)
hof: remove extern

Crate ‘num’ is not required to compile but breaks ‘Run’ button on
website
No more Vec::get() method in rust
Merge pull request #262 from vbuslov/master

hof: remove extern
Merge pull request #263 from AOrazaev/master

Fix example for vectors.
Fixed mut_iter() to iter_mut()
Fixed redundancies in struct patterns
Merge pull request #266 from GBGamer/fix-iter-mut

Fixed mut_iter() to iter_mut()
Merge pull request #267 from GBGamer/fix-for-13

Fixed redundancies in struct patterns
Fix the language in Lifetime's "grok" expression

The expression did not quite work in English. The following sentence was also missing a full-stop.
Merge pull request #271 from allenap/patch-1

lifetimes: Fix the language in "grok" expression
Fix dead_code warnings
Check the description

make all:
* Changed all `fail!()`s to `panic!()`s
* Changed current working directory to unwrap the result

make clean: Changed `rm -rf {bin,stage}` (which doesn't work) to
    `rm -rf bin stage`