View Compilation Error

0_0_11706859_18362.cpp: In function `int main()':
0_0_11706859_18362.cpp:7: error: non-lvalue in assignment
0_0_11706859_18362.cpp:10: error: `abs' undeclared (first use this function)
0_0_11706859_18362.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11706859_18362.cpp:11: error: expected `;' before '}' token