how to add functions in unity code example

Example: functions unity

NumValue = 6;
int myfunc(int num){ // Optional int(s) Go In Parentheses
  // Any Given Code Goes here. If You Want to Use ints, use int name.
  // I Don't know the name for this so i will call it the function description
}
myfunc(NumValue); // Will Run Any Given Code Placed Inside The function description