Elance Exams Answers PDF file

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What does the following line do? memset((char *)&ctl_addr, 0, sizeof(ctl_addr));

Initializes a subset of memory pointed to by &ctl_addr
Given that 0 is passed, it unsets the memory of ctl_addr
Initializes the region of memory pointed to by &ctl_addr
Allocates and initializes memory for variable ctl_addr
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