Question

who will be the king of this queen​

Answer 1

Prince Charles is presently heir (next in line) to the British throne. He will not become king until his mother, Queen Elizabeth, abdicates (gives up the throne), retires or dies. When either of these happen, Prince Charles may abdicate and pass the throne to his eldest son Prince William.

Answer 2

Prince Charles

Upon Queen Elizabeth's death, Prince Charles will immediately become King. So in all probability, the Queen will retain the crown until she passes. Here's what will happen when Queen Elizabeth dies: At the moment of her death, Prince Charles will become king.