Compilare: user.cpp: In function ‘void del(int)’: user.cpp:30: warning: suggest parentheses around ‘+’ inside ‘<<’ user.cpp:31: warning: comparison between signed and unsigned integer expressions user.cpp:32: warning: suggest parentheses around ‘+’ inside ‘<<’ user.cpp:32: warning: comparison between signed and unsigned integer expressions user.cpp:40: warning: suggest parentheses around ‘+’ inside ‘<<’ user.cpp:56: warning: suggest parentheses around ‘+’ inside ‘<<’ user.cpp:56: warning: suggest parentheses around ‘+’ inside ‘<<’ user.cpp:57: warning: suggest parentheses around ‘+’ inside ‘<<’ user.cpp:59: warning: suggest parentheses around ‘+’ inside ‘<<’ user.cpp:60: warning: suggest parentheses around ‘+’ inside ‘<<’ user.cpp:61: warning: suggest parentheses around ‘+’ inside ‘<<’ user.cpp:65: warning: suggest parentheses around ‘+’ inside ‘<<’ user.cpp:32: warning: suggest explicit braces to avoid ambiguous ‘else’