View Compilation Error

0_0_12853412_11538.cpp: In function `int main()':
0_0_12853412_11538.cpp:36: error: `a' undeclared (first use this function)
0_0_12853412_11538.cpp:36: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12853412_11538.cpp:39: error: ISO C++ forbids comparison between pointer and integer
0_0_12853412_11538.cpp:39: error: invalid conversion from `int*' to `int'
0_0_12853412_11538.cpp:40: error: `bin' undeclared (first use this function)