View Compilation Error

0_0_2633665_5584.cpp:3: error: redeclaration of C++ built-in type `long'
0_0_2633665_5584.cpp: In function `int main()':
0_0_2633665_5584.cpp:7: error: `a' undeclared (first use this function)
0_0_2633665_5584.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2633665_5584.cpp:7: error: `b' undeclared (first use this function)