View Compilation Error

0_0_19446402_8173.cpp: In function 'int main()':
0_0_19446402_8173.cpp:11:34: error: 'data' was not declared in this scope
  for(int i=0;i<n;i++)scanf("%d",&data[i]);
                                  ^
0_0_19446402_8173.cpp:12:22: error: 'data' was not declared in this scope
  for(int i=0;i<n;i++)data[i]=-data[i];
                      ^
0_0_19446402_8173.cpp:13:7: error: 'data' was not declared in this scope
  sort(data,data+n);
       ^