Compilare: user.cpp: In function ‘int main()’: user.cpp:19:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(n!=strlen(s2)) ^ user.cpp:15:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &t); ^ user.cpp:17:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%s%c%s", s1, &c, s2); ^