View Compilation Error

0_0_4875199_17891.cpp: In function `int main()':
0_0_4875199_17891.cpp:7: error: `fabs' undeclared (first use this function)
0_0_4875199_17891.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4875199_17891.cpp:9: error: `i' undeclared (first use this function)
0_0_4875199_17891.cpp:11: error: expected primary-expression before "else"
0_0_4875199_17891.cpp:11: error: expected `;' before "else"