View Compilation Error

645475_0_0_660.cpp:4: error: size of array `b' is too large
645475_0_0_660.cpp: In function `int main()':
645475_0_0_660.cpp:12: error: `b' undeclared (first use this function)
645475_0_0_660.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)