Compilare: user.cpp: In function ‘int main()’: user.cpp:169:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (i>0) ^ user.cpp: In function ‘void gr2()’: user.cpp:76:13: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized] float a,x1,x2; ^ user.cpp:76:16: warning: ‘x2’ may be used uninitialized in this function [-Wmaybe-uninitialized] float a,x1,x2; ^