Compilare: user.cpp: In function ‘void structura()’: user.cpp:42:4: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] *p=NULL; ^ user.cpp: In function ‘void fisier()’: user.cpp:67:24: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] for (i=poz; s[i]>='a' && s[i]<='z' || s[i]<='9' && s[i]>='0'; i++) nf[i-poz]=s[i]; ^ user.cpp:68:11: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] nf[i-poz]=NULL; ^ user.cpp: In function ‘void citire()’: user.cpp:32:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dir.in","r",stdin); ^ user.cpp:33:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s); ^ user.cpp: In function ‘void afisare()’: user.cpp:80:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dir.out","w",stdout); ^