View Compilation Error

0_0_30163119_31597.cpp:6:1: error: expected ',' or ';' before 'double'
 double w[maxn];int c[maxn];
 ^
0_0_30163119_31597.cpp: In function 'int main()':
0_0_30163119_31597.cpp:14:24: error: 'w' was not declared in this scope
             cin>>c[i]>>w[i];
                        ^
0_0_30163119_31597.cpp:20:44: error: 'w' was not declared in this scope
                 dp[j]=min(dp[j],dp[j-c[i]]*w[i]);
                                            ^