Compilare: user.cpp: In function ‘int main()’: user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp:58: warning: comparison between signed and unsigned integer expressions user.cpp:61: warning: comparison between signed and unsigned integer expressions user.cpp:13: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:19: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result In file included from /usr/include/string.h:640, from /usr/include/c++/4.4/cstring:45, from user.cpp:3: In function ‘void* memset(void*, int, size_t)’, inlined from ‘int main()’ at user.cpp:17: /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/ccT7xu9t.o: In function `main': user.cpp:(.text+0xb9): warning: memset used with constant zero length parameter; this could be due to transposed parameters