Main.cc: In function 'int main()': Main.cc:5:2: error: expected ',' or ';' before 'int' int i,j; ^ Main.cc:6:7: error: 'i' was not declared in this scope cin>>i>>j; ^ Main.cc:6:10: error: 'j' was not declared in this scope cin>>i>>j; ^ Main.cc:4:6: warning: unused variable 'a' [-Wunused-variable] int a[3][4]={1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23} ^