If Post Type equals, then display X content

Question

I just need to say in single.php if post type = x then display y. Else, don't display it.

Answer 1

if( get_post_type() == 'post_type_slug' ) {
    //do some stuff
} else {
    //do other stuff
}

Should do it, alternately you can use templates to handle that, which wordpress has setup pretty well by default. See the codex page on template hierarchy, specifically I find the visual overview to be quite useful.

Answer 2

Is this what you're looking for? (where 'product' would be the post type)

if ( is_singular('product') ) {
    // do stuff
} else {
    // do something else
}

Answer 3

It depends a bit on what exactly y is, but this should probably help you out: http://codex.wordpress.org/Conditional_Tags#A_Post_Type