Function (error prone)

Function passing array , When the pointer , It's just the starting address .

example ：1 Sum of dimension groups

  Find out , Find the size of the array , be equal to 2？ instead of 5？

Explain it. 2 How did you get it ： Because mine is 64 It's a plane , and sizeof(int) Everybody knows ,4 byte ,32 position ; therefore sizeof(p), It should be 64; Why 64？ Because I said the first sentence ： Function passing array , When the pointer , What is passed is only an address ,64 Address of bit machine , No, it is. 64bit Well .

therefore , To make an array （ The pointer ） Size , It should also be passed to the function in the form of formal parameters .

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A character array , Because there is at the end '\0', So sometimes it is not necessary to pass the array size when passing parameters

example ： Remove spaces from string