Compilare: user.cpp: In function ‘int fact(int&)’: user.cpp:31:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind<=s.size() && (isdigit(s[ind])!=0) || s[ind]=='-') ~~~^~~~~~~~~~ user.cpp:31:25: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while(ind<=s.size() && (isdigit(s[ind])!=0) || s[ind]=='-') ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int patr(int&)’: user.cpp:49:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind<=s.size() && s[ind]!=']') ~~~^~~~~~~~~~ user.cpp: In function ‘int rot(int&)’: user.cpp:61:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind<=s.size() && s[ind]!=')') ~~~^~~~~~~~~~ user.cpp: In function ‘int eval(int&)’: user.cpp:79:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind<=s.size() && s[ind]==',') ~~~^~~~~~~~~~ user.cpp:83:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind==s.size()) ~~~^~~~~~~~~~