View Compilation Error

0_0_25048096_11319.cpp:2:3: error: stray '#' in program
 2.#include <string.h>  
   ^
0_0_25048096_11319.cpp:3:3: error: stray '#' in program
 3.#include <math.h>  
   ^
0_0_25048096_11319.cpp:4:3: error: stray '#' in program
 4.#include <algorithm>  
   ^
0_0_25048096_11319.cpp:6:3: error: stray '#' in program
 6.#define pi acos(-1.0)  
   ^
0_0_25048096_11319.cpp:7:3: error: stray '#' in program
 7.#define exp 1e-8  
   ^
0_0_25048096_11319.cpp:2:1: error: expected unqualified-id before numeric constant
 2.#include <string.h>  
 ^
0_0_25048096_11319.cpp:6:1: error: expected unqualified-id before numeric constant
 6.#define pi acos(-1.0)  
 ^