Compilare: user.cpp: In function ‘int main()’: user.cpp:14:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(s)-1;i++) ~^~~~~~~~~~~~ user.cpp:11:19: warning: unused variable ‘p’ [-Wunused-variable] char s[5001],*p,sep[]=",. !?-:;'"; ^ user.cpp:11:21: warning: unused variable ‘sep’ [-Wunused-variable] char s[5001],*p,sep[]=",. !?-:;'"; ^~~