Compilare: user.cpp: In function ‘int main()’: user.cpp:16:36: warning: left operand of comma operator has no effect [-Wunused-value] for( int g = 0, i = a-l; g <= l, i <= a; g ++, i ++ ){ ^ user.cpp:22:38: warning: left operand of comma operator has no effect [-Wunused-value] for( int g = l-1, i = a+1; g >= 0, i <= a+l; g --, i ++ ){ ^