Main.cc: In function 'int main()': Main.cc:4:15: error: conflicting declaration 'int a' int a[7],sum,a; ^ Main.cc:4:6: error: 'a' has a previous declaration as 'int a [7]' int a[7],sum,a; ^ Main.cc:9:3: error: incompatible types in assignment of 'int' to 'int [7]' a=sum/7; ^