11. What is the result of the expression &variable in C, where variable is a variable of type int?
12. In C, what is a double pointer (int**)?
13. What is the result of the expression ptr = NULL in C, where ptr is a pointer?
14. In C, what is the purpose of the 'malloc' function?
15. What is the result of the expression *NULL in C?
16. In C, what is the purpose of the 'memcpy' function?
17. What is the result of the expression sizeof(char*) in C, assuming a char pointer on a typical system?
18. In C, how do you declare an array of pointers to integers?
19. What is the purpose of the 'free' function in C when used with pointers?
20. In C, what is a pointer to a constant value (const int*)?
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