/in/foo.cc: In function 'int main()':
/in/foo.cc:20:26: warning: format '%d' expects a matching 'int' argument [-Wformat=]
             printf("%d\n"),abs(a[1]-a[0]);
                          ^
/in/foo.cc:20:31: warning: right operand of comma operator has no effect [-Wunused-value]
             printf("%d\n"),abs(a[1]-a[0]);
                            ~~~^~~~~~~~~~~
/in/foo.cc:59:18: warning: statement has no effect [-Wunused-value]
             for(i;i<N;i++){
                  ^
/in/foo.cc:50:17: warning: unused variable 'sub' [-Wunused-variable]
             int sub=10,temp[10];
                 ^~~