View Compilation Error

0_0_33723775_1012.cpp: In function 'int main()':
0_0_33723775_1012.cpp:5:13: error: 'fabs' was not declared in this scope
     B=fabs(A);
             ^
0_0_33723775_1012.cpp:7:12: error: expected primary-expression before ')' token
     return );
            ^
0_0_33723775_1012.cpp:7:12: error: expected ';' before ')' token
0_0_33723775_1012.cpp:7:12: error: expected primary-expression before ')' token