light.cpp: In function 'int main()': light.cpp:71: warning: suggest parentheses around '-' inside '<<' In file included from /usr/include/string.h:640, from /usr/include/c++/4.4/cstring:45, from light.cpp:2: In function 'void* memset(void*, int, size_t)', inlined from 'int main()' at light.cpp:72: /usr/include/bits/string3.h:83: warning: call to '__warn_memset_zero_len' declared with attribute warning: memset used with constant zero length parameter; this could be due to transposed parameters /tmp/ccIKE25i.o: In function `main': light.cpp:(.text+0x83e): warning: memset used with constant zero length parameter; this could be due to transposed parameters