201089_0_20633.cpp:3: error: `main' must return `int'
201089_0_20633.cpp: In function `int main(...)':
201089_0_20633.cpp:4: error: `A' undeclared (first use this function)
201089_0_20633.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
201089_0_20633.cpp:4: error: `B' undeclared (first use this function)
201089_0_20633.cpp:4: error: functional cast expression list treated as compound expression
201089_0_20633.cpp:9: error: `area' undeclared (first use this function)
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