View Compilation Error

0_0_4754306_5938.cpp:2:18: cmath.h: No such file or directory
0_0_4754306_5938.cpp: In function `int main()':
0_0_4754306_5938.cpp:12: error: `sqrt' undeclared (first use this function)
0_0_4754306_5938.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4754306_5938.cpp: At global scope:
0_0_4754306_5938.cpp:16: error: expected declaration before '}' token