View Compilation Error

0_0_6172301_29421.cpp:3: error: `main' must return `int'
0_0_6172301_29421.cpp: In function `int main(...)':
0_0_6172301_29421.cpp:15: error: name lookup of `i' changed for new ISO `for' scoping
0_0_6172301_29421.cpp:7: error:   using obsolete binding at `i'
0_0_6172301_29421.cpp:17: error: `abs' undeclared (first use this function)
0_0_6172301_29421.cpp:17: error: (Each undeclared identifier is reported only once for each function it appears in.)