/in/foo.cc: In function 'int main(int, char**)':
/in/foo.cc:11:12: warning: unused variable 'k' [-Wunused-variable]
int i, j, k;
^
/in/foo.cc: In function 'int Mul(BigInt*, int)':
/in/foo.cc:68:14: warning: unused variable 'k' [-Wunused-variable]
int jw = 0, k = 0;
^
/in/foo.cc: In function 'int main(int, char**)':
/in/foo.cc:19:10: warning: 'nb' may be used uninitialized in this function [-Wmaybe-uninitialized]
int na, nb;
^~
/in/foo.cc:19:6: warning: 'na' may be used uninitialized in this function [-Wmaybe-uninitialized]
int na, nb;
^~