View Compilation Error

0_0_4459471_26269.cpp: In function `bool isconterclock(int, POINT*)':
0_0_4459471_26269.cpp:301: error: `area_of_polygon' undeclared (first use this function)
0_0_4459471_26269.cpp:301: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4459471_26269.cpp: In function `int main()':
0_0_4459471_26269.cpp:328: error: expected `(' before "for"
0_0_4459471_26269.cpp:328: error: name lookup of `i' changed for new ISO `for' scoping
0_0_4459471_26269.cpp:320: error:   using obsolete binding at `i'
0_0_4459471_26269.cpp:328: error: expected `;' before ')' token