Hi,
What is the internals of a 'switch-case' satement ? Does it use 'if' internally or what is the logic internally ?
Could someone here tell the design of 'switch-case' statement .
Kindly share your views/ideas.
Tonnes of Thx in advans, Karthik Balaguru
write a test program and compile it to intermediate assembler code instead of making an executable. Then read the assembler code.
cc -S test.c
and understand that the output may vary depending upon the compiler used and the target processor type.
A good compiler such as gnu optimizes the implementation according to the cases in question
- either a series of compare and jump if equal (small case statements)
- or search a list, find the n'th element and use the n'th element of a jump table (big case statements with arbitrary values)
- or calculate a jump from the case variable (big case statements with a range of consecutive case values)
-Michael
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