A simple test of embedded C knowledge for pre-screening potential hires.Full description
Descripción: Programación de microcontroladores c ccs
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Embedded system is a combination of Hardware and Software. Microcontroller like AT89SX, PIC, ARDUINO which places a vital role on this.
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Descripción: Application domains have had a considerable impact on the evolution of embedded systems in terms of required methodologies and supporting tools, and resulting technologies. Multimedia and network ...
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Q: Which of the following is the most portable wa y to declare a C preprocessor constant for the number of seconds in a (non-leap) calendar year? Answers
Q: Which of the following is the most flexible way to declare a C preprocessor macro that takes two arguments and returns the smaller of their two values? Answers
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#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;
Q: Which of the following constructs can be used to create a portable infinite loop in C? Answers
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while (1) { ... } for (;;) { ... } loop: ... goto loop; All of the above
Q: Which of the following statements accurately describes the intended effect of the declaration int (* a)[10];? Answers
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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
Q: Which of the following statements accurately describes a use of C's static keyword? Answers
A variable declared static within the body bod y of a function maintains its value between function invocations A variable declared static outside the body of a function can only be
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accessed by functions within the same module. Both of the above are accurate Neither of the above are accurate; static is used for function declarations
Q: Which of the following statements accurately describes the meanin g of the declaration int * const x;? Answers
Correct Answer User Answer
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
Q: Which of the following items should generally be declared using C's volatile keyword? Answers
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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
Q: Which of the following code snippets can be used to reset the least-significant bit of x? Answers
Correct Answer User Answer
x & 0x01; x & ~0x01; x | ~0x01; x &= ~0x01;
Q: Which ANSI C compilers allow a variable to be declared both volatile and const? Answers
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
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Q: Which of the following is a correct way to write the value 0xAA55 to physical memory address 0x67A9? Answers
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;
