View Compilation Error

0_0_15978196_11047.cpp: In function 'int main()':
0_0_15978196_11047.cpp:18:26: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
         for(int i = 0; i<n; i++) 
                          ^
0_0_15978196_11047.cpp:20:25: error: 'x' was not declared in this scope
             scanf("%d",&x);
                         ^