View Compilation Error

0_0_4837615_30588.cpp: In function `int main()':
0_0_4837615_30588.cpp:6: error: ISO C++ forbids comparison between pointer and integer
0_0_4837615_30588.cpp:12: error: `ia' undeclared (first use this function)
0_0_4837615_30588.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)