Compilare: user.cpp: In function ‘void structura()’: user.cpp:14:7: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] *p=NULL; ^ user.cpp:31:37: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] for (i=poz;s[i]>='a'&&s[i]<='z'||s[i]<='9'&&s[i]>='0';i++) ^ user.cpp:35:26: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] nf[i-poz]=NULL; ^ user.cpp: In function ‘int main()’: user.cpp:54:18: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[1601]’ [-Wformat=] scanf("%s",&s); ^