Compilare: user.cpp: In function ‘long int calc(long int, long int)’: user.cpp:40:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (k==0) ^ user.cpp:50:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (k==0) ^ user.cpp:24:9: warning: variable ‘t’ set but not used [-Wunused-but-set-variable] long t=1; ^