View Compilation Error

0_0_5433598_25124.cpp:17: error: cannot declare `::main' to be inline
0_0_5433598_25124.cpp:17: error: `main' must return `int'
0_0_5433598_25124.cpp: In function `int main(...)':
0_0_5433598_25124.cpp:26: error: `slope' undeclared (first use this function)
0_0_5433598_25124.cpp:26: error: (Each undeclared identifier is reported only once for each function it appears in.)