Compilare: user.cpp: In function ‘int main()’: user.cpp:18: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:19: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result In file included from /usr/include/string.h:640, from user.cpp:2: In function ‘void* memset(void*, int, size_t)’, inlined from ‘int main()’ at user.cpp:60: /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 In function ‘void* memset(void*, int, size_t)’, inlined from ‘int main()’ at user.cpp:61: /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/cc37v3ta.o: In function `main': user.cpp:(.text+0x25e): warning: memset used with constant zero length parameter; this could be due to transposed parameters