Compilare: user.cpp: In constructor ‘expresie::expresie()’: user.cpp:30:29: warning: suggest parentheses around assignment used as truth value [-Wparentheses] ex[i] = coef[i] = 0; ~~~~~~~~^~~ user.cpp: In constructor ‘expresie::expresie(char)’: user.cpp:34:29: warning: suggest parentheses around assignment used as truth value [-Wparentheses] ex[i] = coef[i] = 0; ~~~~~~~~^~~ user.cpp: In function ‘void rezolvare()’: user.cpp:97:14: warning: unused variable ‘prev’ [-Wunused-variable] char ch, prev = '/'; ^~~~