Compilare: user.cpp: In function ‘int main()’: user.cpp:44:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(a)-1;) ^ user.cpp:61:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[x++]=a[i++]; ^ user.cpp:62:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[x]='\0'; ^ user.cpp:39:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reteta2.in", "r", stdin); ^ user.cpp:42:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(a, Nmax, stdin); ^