Compilare: user.cpp: In function ‘void ins1(T*, char*, int)’: user.cpp:24:17: warning: NULL used in arithmetic [-Wpointer-arith] if( *str == NULL ) ^ user.cpp: In function ‘void ins2(T*, char*)’: user.cpp:38:17: warning: NULL used in arithmetic [-Wpointer-arith] if( *str == NULL ) ^ user.cpp: In function ‘int main()’: user.cpp:68:19: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] in >> str + 1; ^ user.cpp:79:19: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] in >> str + 1; ^