Compilare: user.cpp: In function ‘char peek()’: user.cpp:56:8: warning: unused variable ‘p’ [-Wunused-variable] TNOD *p; ^ user.cpp: In function ‘int main()’: user.cpp:77:19: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[1001]’ [-Wformat=] fscanf(f,"%s",&a); ^ user.cpp:80:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<strlen(a); j++) ^ user.cpp:67:8: warning: variable ‘p’ set but not used [-Wunused-but-set-variable] TNOD *p; ^