/in/sq.cpp:7:7: error: assigning to 'float' from incompatible type 'char *'
    n=argv[1];
      ^~~~~~~
/in/sq.cpp:8:7: error: assigning to 'float' from incompatible type 'char *'
    N=argv[argc-1];
      ^~~~~~~~~~~~
/in/sq.cpp:10:48: error: assigning to 'float' from incompatible type 'char *'
    for (int i=1;i<(argc-1);i++) quantity[i-1]=argv[i];
                                               ^~~~~~~
3 errors generated.