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                使用后該指針變量ptr一定要重新指向NULL,防止野指針出現,有效 規避誤操作。比如如下: 當然這是C版的;不全但是最后結果看截圖。可以知道ptr指向還是原來的內存單元,只不過是該內存單元被標示可擦除了。 ~~~ typedef struct data{ int year; char *name; }Data; Data *pd=malloc(sizeof(Data)); pd->name="pengrong"; pd->year=32; printf("%s\t%d\n",pd->name,pd->year); free(pd); printf("%s\t%d\n",pd->name,pd->year); ~~~ 輸出 ![這里寫圖片描述](https://box.kancloud.cn/2016-02-24_56cd211dcc378.jpg "") 沒free的話 你的printf會按規定的數據類型去打印 而你free以后 沒有了數據類型限定的內存單元空間 printf方法就沒辦法正常打印了 所以調用完后必須把ptr手動賦值為null;防止野指針存在。
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