Compilare: user.cpp: In function ‘int main()’: user.cpp:33:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(s)){ ^ user.cpp:42:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<strlen(s)){ ^ user.cpp:14:11: warning: unused variable ‘p’ [-Wunused-variable] char *p, *pp; ^ user.cpp:14:15: warning: unused variable ‘pp’ [-Wunused-variable] char *p, *pp; ^ user.cpp:15:10: warning: unused variable ‘ch’ [-Wunused-variable] char ch; ^ user.cpp:20:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d\n", &n); ^ user.cpp:22:27: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 270, fin); ^