You need to modify the argument type from char to const char:
void fun (const char * Petr) {/*...*/}
A sharp pointed tip
Throwing a pointed weapon.
A pointed piece of land extending into an ocean or a lake.
An arrow is a pointed shaft with feathers for guidance, and shot from a bow.
A mark like a six-pointed star which looks like this: *
Criticism refers to very pointed and possibly derogatory reports on something.
In Architecture, a pointed or Gothic arch. In Statistics, a cumulative frequency graph.
A gimlet is a small pointed tools for marking or making holes in soft material like leather.
Piercing: to penetrate into or run through (something), as a sharp, pointed dagger, object, or instrument does. http://dictionary.reference.com/browse/piercing
The prong on a fork is called a tine (plural tines). By definition, a tine is: 1. prong: a thin pointed projection of a utensil or implement such as a fork or pitchfork2. antler's branch: a pointed branch of a deer's antler
the sperm is the male sex cell and it is adapeted by having a pointed head for speed, and a long tail to help it swim.
You're moving east - that's the definition (in fact) of "east". [And at dawn (when standing) your head is pointed in the direction that the earth is moving around the sun.]