Compilare: user.cpp: In function ‘void Edit(char*, char*, char*, int)’: user.cpp:23:10: warning: statement has no effect [-Wunused-value] for(i; S[i] != '\000' && !isdigit(S[i]) ;i++){ ^ user.cpp:30:10: warning: statement has no effect [-Wunused-value] for(i; S[i] != '\000' && (isdigit(S[i]) || isalpha(S[i]));i++){ ^ user.cpp: In function ‘int main()’: user.cpp:129:23: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result [-Wunused-result] system("cls"); ^ In file included from /usr/include/string.h:642:0, from /usr/include/c++/4.8/cstring:42, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:48, from user.cpp:1: In function ‘void* memset(void*, int, size_t)’, inlined from ‘int Deletew(trie*, char*)’ at user.cpp:53:50: /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/ccoz3uLN.o: In function `Deletew(trie*, char*)': user.cpp:(.text+0x241): warning: memset used with constant zero length parameter; this could be due to transposed parameters