Embedded c Quiz

Which of the following is the most portable way to declare a C preprocessor cons tant for the number of seconds in a (non-leap) calendar year? Choose one #define SECONDS_PER_YEAR 60 * 60 * 24 * 365 #define SECONDS_PER_YEAR 60 * 60 * 24 * 365; * #define SECONDS_PER_YEAR (60 * 60 * 24 * 365UL) #define SECONDS_PER_YEAR (60 * 60 * 24 * 365) -------Which of the following is the most flexible way to declare a C preprocessor macr o that takes two arguments and returns the smaller of their two values? Choose one * #define MIN(A, B) ((A) < (B) ? (A) : (B)) #define MIN(A, B) { if (A < B) A; else B; } #define MIN(A, B) ((A < B) ? A : B) #define MIN(A, B) A < B ? A : B; -------Which of the following constructs can be used to create a portable infinite loop  in C? Choose one while (1) { ... } for (;;) { ... } loop: ... goto loop; * All of the above --------Which of the following statements accurately describes the intended effect of th e declaration int (* a)[10];? Choose one An array of ten integers * A pointer to an array of ten integers An array of ten pointers to integers An array of ten pointers to functions --------Which of the following statements accurately describes a use of C's static keywo rd? Choose one A variable declared static within the body of a function maintains its v alue between function invocations A variable declared static outside the body of a function can only be ac cessed by functions within the same module. * Both of the above are accurate Neither of the above are accurate; static is used for function declarati ons --------Which of the following statements accurately describes the meaning of the declar ation int * const x;? Choose one * x is a constant pointer to an integer x is a pointer to a constant integer x is a constant integer value None of the above; it's an invalid C declaration

--------Which of the following items should generally be declared using C's volatile key word? Choose one A memory-mapped peripheral status register A global variable used within an interrupt service routine A global variable used by multiple tasks in a multi-threaded application * All of the above ---------Which of the following code snippets can be used to reset the least-significant bit of x? Choose one x & 0x01; x & ~0x01; x | ~0x01; * x &= ~0x01; --------Which ANSI C compilers allow a variable to be declared both volatile and const? Choose one * All ANSI C compilers allow this No ANSI C compilers allow this; it is a K&R C holdover Most ANSI C compilers allow this Only the GNU C compiler allows this ----------Which of the following is a correct way to write the value 0xAA55 to physical me mory address 0x67A9? Choose one uint16_t * p = (uint16_t *) 0x67A9; p = 0xAA55; uint16_t * p = (uint16_t *) 0xAA55; p = 0x67A9; * * (uint16_t * const) (0x67A9) = 0xAA55; * (uint16_t * const) (0xAA55) = 0x67A9;