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struct XX{ int a; char b;};
XX 就是结构标记
void * malloc(int n);
void * calloc(int n, int size);
void * realloc(void *p, int n);
calloc分配的内存是初始化的适合为数组分配空间,malloc为未初始化的需使用 void * memset(void * p, int c int n) 初始化。 realloc可以分配新的空间并拷贝之前的数据。
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