Main.cc: In function 'int main()': Main.cc:13:9: error: conflicting declaration 'int a' int a,a1,a2; ^ Main.cc:7:11: note: previous declaration as 'int a [1000]' int n,a[1000]; ^ Main.cc:14:7: error: incompatible types in assignment of 'int' to 'int [1000]' a = abs (a[1] - a[2]); ^ Main.cc:21:11: error: incompatible types in assignment of 'int' to 'int [1000]' a = abs (a[i] - a[j]); ^ Main.cc: At global scope: Main.cc:26:11: error: 'cout' does not name a type } cout<