/in/foo.cc: In function 'int main()':
/in/foo.cc:31:27: warning: format '%d' expects argument of type 'int', but argument 2 has type 'double' [-Wformat=]
    printf("%d",(1+0.2)*sum);
                           ^
/in/foo.cc:23:12: warning: 's2' may be used uninitialized in this function [-Wmaybe-uninitialized]
    s2=(M-s1+s2)%100;
       ~~~~~^~~~