View Compilation Error

0_0_25031367_21986.cpp:14:1: error: expected ',' or ';' before 'double'
 double s[maxn];
 ^
0_0_25031367_21986.cpp: In function 'void db()':
0_0_25031367_21986.cpp:17:5: error: 's' was not declared in this scope
     s[1]=1.0;
     ^
0_0_25031367_21986.cpp: In function 'int main()':
0_0_25031367_21986.cpp:30:30: error: 's' was not declared in this scope
             printf("%.5lf\n",s[maxn-10]);
                              ^
0_0_25031367_21986.cpp:38:30: error: 's' was not declared in this scope
             printf("%.5lf\n",s[x]);
                              ^