Compilare: user.cpp: In function ‘void ec()’: user.cpp:61:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(s)) ^ user.cpp:98:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(x==x2) ^ user.cpp:89:31: warning: ‘nr2’ may be used uninitialized in this function [-Wmaybe-uninitialized] nr2=nr2+r*semn; ^