View Compilation Error

1_734_2116_28854.cpp: In function 'int main()':
1_734_2116_28854.cpp:5:13: error: expected primary-expression before '=' token
 #define exp = 1e-7;
             ^
1_734_2116_28854.cpp:27:44: note: in expansion of macro 'exp'
             if(b[i] - (double)time*speed > exp)time++;
                                            ^
1_734_2116_28854.cpp:5:19: error: expected ')' before ';' token
 #define exp = 1e-7;
                   ^
1_734_2116_28854.cpp:27:44: note: in expansion of macro 'exp'
             if(b[i] - (double)time*speed > exp)time++;
                                            ^
1_734_2116_28854.cpp:27:47: error: expected primary-expression before ')' token
             if(b[i] - (double)time*speed > exp)time++;
                                               ^