Compilare: user.cpp: In function ‘int main()’: user.cpp:15:49: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf ( fin, "%d%d%d%d", &N, &S, &K1, &K2 ); ^ user.cpp:18:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf ( fin, "%d", &A[i] ); ^ user.cpp:21:35: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets ( friendsA, 1 + N, fin ); ^ user.cpp:23:35: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets ( friendsB, 1 + N, fin ); ^