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Embedded SW Interview Questions

Embedded SW Interview Questions

  1. 1. Embedded SystemsEng. Mohammed Sokkaree
  2. 2. Agenda• Introduction to embedded Systems• Why embedded C• Interview questions• Q&A
  3. 3. Computing Systems
  4. 4. What’s ES?• System designed to do one or a few dedicated and/or specific functions.• combination of computer hardware and software ▫ Mp3 player ▫ Mobile ▫ Medical testing systems ▫ Anti-Lock Brakes
  5. 5. Embedded SW• Portability• Optimization• Quality• Readability• Complexity• HW Compatibility “ HW knowledge”• Min. Resources
  6. 6. Why embedded C?
  7. 7. Question 1 RTD
  8. 8. Question 1• Real time System ▫ Hard ▫ Soft• CBT
  9. 9. Question 2 SWE
  10. 10. Question 2• Testing ▫ Types of testing• Debugging
  11. 11. Question 3 Pointers
  12. 12. Pointers Pointers & Pointers• Using the variable a, give definitions for the following: ▫ a) An integer ▫ b) A pointer to an integer ▫ c) A pointer to a pointer to an integer ▫ d) An array of 10 integers ▫ e) An array of 10 pointers to integers ▫ f) A pointer to an array of 10 integers ▫ g) A pointer to a function that takes an integer as an argument and returns an integer ▫ h) An array of ten pointers to functions that take an integer argument and return an integer
  13. 13. Answer• a) int a; // An integer• b) int *a; // A pointer to an integer• c) int **a; // A pointer to a pointer to an integer• d) int a[10]; // An array of 10 integers• e) int *a[10]; // An array of 10 pointers to integers• f) int (*a)[10]; // A pointer to an array of 10 integers• g) int (*a)(int); // A pointer to a function a that takes an integer argument and returns an integer• h) int (*a[10])(int); // An array of 10 pointers to functions that take an integer argument and return an integer
  14. 14. Question 4 Macros
  15. 15. Question 4 Functions Function like macros How it works Input arguments
  16. 16. Question 4 (Cont.)• Write a macro to set the MSB#define MSB(X) ((X) | (1 << ((sizeof(X)<<3) -1))
  17. 17. Question 5 Variables
  18. 18. Question 5• Local• Global• Static• Extern
  19. 19. Question 6 Tracing
  20. 20. Question 6int main() X Y 2 1{int x=1,y=1; 3 1for(;y;printf("%d %dn",x,y)) 4 1y=x++<=5; 5 1return 0; 6 1 7 0}
  21. 21. Thank you
  22. 22. Connect via LinkedIn http://eg.linkedin.com/in/engmohammed
  23. 23. Hi all, I have a basic C programming query. For the program, #define MAX(x,y) (x)>(y)?(x):(y) void main( ) { int i=10, j=5, k=0; k=MAX(i++,++j); printf("%d %d %d",i,j,k); } I get the output as 12,6,11 whereas, when I modify the program as below int max_fn(a,b); void main( ) { int i=10, j=5, k=0; k = max_fn(i++,++j); printf("%d %d %d",i,j,k); } int max_fn(a,b) { return((a)>(b)?(a):(b)); } In this case, I get the output as 11,6,10.
  24. 24. http://www.tiobe.com/index.php/content/paperinfo/tpci/index.html

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