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格式化指示符 %p 是用于指針的,后面相應的參數就應該是指針。
ppp 本身是整型,不應直接傳入。這樣的代碼一般能通過編譯,但一定會有警告的。printf就會將這個整型值當作是指針來理解并輸出,但這樣的輸出結果是沒什么意義的。
&ppp 將ppp取地址后得到的就等于是指針,所以能匹配格式化指示符,printf應該可以正確打印出結果。
至于 %p 會把指針打印成什么格式,這是和平臺相關的,一般會以十六進制格式打印出地址值。
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