Compilare: user.cpp: In function ‘void decodif()’: user.cpp:18:51: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] for(int j=i+7;j>=i+1;j--){c+=(s[j]=='1')*(1<<i+7-j);} ~~~^~ user.cpp: In function ‘int main()’: user.cpp:24:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(s)/8;i++){ ~^~~~~~~~~~~~