foo.cc: In function ‘int main()’:
foo.cc:6:57: error: expected primary-expression before ‘<’ token
    6 |                         cout<<i<<' '<<"*"<<' '<<j<<"="<<<' '<i*j<<' ';
      |                                                         ^
foo.cc:6:65: warning: left shift count >= width of type [-Wshift-count-overflow]
    6 |                         cout<<i<<' '<<"*"<<' '<<j<<"="<<<' '<i*j<<' ';
      |                                                              ~~~^~~~~