View Compilation Error

0_0_3199219_5006.cpp:2:8: macro names must be identifiers
0_0_3199219_5006.cpp: In function `int main()':
0_0_3199219_5006.cpp:13: error: `sqrt' undeclared (first use this function)
0_0_3199219_5006.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3199219_5006.cpp: At global scope:
0_0_3199219_5006.cpp:27: error: expected declaration before '}' token