/in/foo.cc: In function 'int main()':
/in/foo.cc:10:8: warning: statement has no effect [-Wunused-value]
    tina+days;
    ~~~~^~~~~
/in/foo.cc:60:9: warning: 'tina' may be used uninitialized in this function [-Wmaybe-uninitialized]
     tina+=1;
     ~~~~^~~