Compilare: user.cpp: In function ‘int main()’: user.cpp:55:20: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] int good = 1<<m - 1; ^ In file included from /usr/include/string.h:642:0, from user.cpp:4: In function ‘void* memset(void*, int, size_t)’, inlined from ‘int main()’ at user.cpp:70:40: /usr/include/i386-linux-gnu/bits/string3.h:82:32: 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 [enabled by default] __warn_memset_zero_len (); ^ In function ‘void* memset(void*, int, size_t)’, inlined from ‘int main()’ at user.cpp:71:40: /usr/include/i386-linux-gnu/bits/string3.h:82:32: 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 [enabled by default] __warn_memset_zero_len (); ^ /tmp/ccg5H7C5.o: In function `main': user.cpp:(.text.startup+0x2c4): warning: memset used with constant zero length parameter; this could be due to transposed parameters