CIS*2750: Midterm Questions and Correct Answers/ Latest Update / Already Graded

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CIS*2750: Midterm Questions and Correct
Answers/ Latest Update / Already Graded
Parameters of qsort

Ans: Void * base, size_t nel, size_t width, int (*compar) (const
void*, const void*)) (Pointer to array, element in array, size of
elements, comparator function)


How does the comparator function work?

Ans: Cast the void pointer to the type of pointer in the given
array


Assign the values of the given parameters to the pointers


Subtract a from b


If a < b, return -1
If b < a, return 1
If a == b, return 0


-o flag

Ans: Produces an output file


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-Wall flag

Ans: Activates all warnings


-pedantic flag

Ans: Produces more specific warning


-std=c99 flag

Ans: Uses the c99 standard to compile


gcc

Ans: Preprocessor - translate directives "#" into more C code -
Use -E


Linker - connects you object code to standard (or non standard)
libraries default


Compiler - converts C code into object code - Use -c


Linking Libraries



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Ans: Use -l(name of library) *no space


Use -L to provide a path to a library isn't in the d efaults


-fPIC flag

Ans: Creates a position independent code; use it when creating
.o file


-shared flag

Ans: Created a shared library


Name your file .so


Allows for one library to be used between multiple applications


export LD_LIBRARY_PATH=.

Ans: Tells the OS the pwd of the shared library at runtime


Make

Ans: Program to make repeated tasks easier



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