View Compilation Error

0_0_30955266_13434.cpp: In function 'int main()':
0_0_30955266_13434.cpp:5:15: error: redeclaration of 'int x'
     int n,x,y,x,i;
               ^
0_0_30955266_13434.cpp:5:11: note: 'int x' previously declared here
     int n,x,y,x,i;
           ^
0_0_30955266_13434.cpp:9:21: error: 'z' was not declared in this scope
         x = 0,y = 0,z = n,i;
                     ^