Function related matters

C Function related

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The actual parameter （ Actual parameters ）：

Formal parameters （ Shape parameter ）：

Function call ：

Value transfer call ： The formal and actual parameters of a function occupy different memory blocks , Modification of a parameter does not affect the argument .

Address call ： Address call is a way to call a function by passing the memory address of the created variable outside the function to the function parameter . This parameter transfer method can establish a real relationship between the function and the variables outside the function , That is, you can directly operate inside the function As a variable outside the function

Be careful If the passed array is a parameter , The essence is to pass the first address of the array

  Function declaration , Definition