View Compilation Error

0_0_3073589_11271.cpp:2:19: cmath.h: No such file or directory
0_0_3073589_11271.cpp: In function `int main()':
0_0_3073589_11271.cpp:7: error: expected primary-expression before "double"
0_0_3073589_11271.cpp:7: error: expected `;' before "double"
0_0_3073589_11271.cpp:9: error: expected primary-expression before '=' token
0_0_3073589_11271.cpp:9: error: `r' undeclared (first use this function)
0_0_3073589_11271.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3073589_11271.cpp:9: error: stray '\' in program