View Compilation Error

0_0_2576937_13441.cpp:2:9: #include expects "FILENAME" or <FILENAME>
0_0_2576937_13441.cpp: In function `int main()':
0_0_2576937_13441.cpp:7: error: `sqrt' undeclared (first use this function)
0_0_2576937_13441.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2576937_13441.cpp:8: error: `o' undeclared (first use this function)