Compilare: user.cpp: In function ‘char peek()’: user.cpp:45:8: warning: unused variable ‘p’ [-Wunused-variable] TNOD *p; ^ user.cpp: In function ‘int main()’: user.cpp:63:19: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[101]’ [-Wformat=] fscanf(f,"%s",&a); ^ user.cpp:65:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<strlen(a); j++) ^