View Compilation Error

0_0_22168226_20702.cpp: In function 'int main()':
0_0_22168226_20702.cpp:5:5: error: redeclaration of 'int a'
 int a=0,n=1;
     ^
0_0_22168226_20702.cpp:4:5: note: 'int a' previously declared here
 int a,n,sum;
     ^
0_0_22168226_20702.cpp:5:9: error: redeclaration of 'int n'
 int a=0,n=1;
         ^
0_0_22168226_20702.cpp:4:7: note: 'int n' previously declared here
 int a,n,sum;
       ^