Compilare: user.cpp: In function ‘int main()’: user.cpp:10:11: warning: unused variable ‘fdout’ [-Wunused-variable] FILE *fdout = fopen("carti3.out", "w"); ^ user.cpp:14:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fdin, "%d%d", &n, &c); ^ user.cpp:16:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fdin, "%d", &book); ^ user.cpp:20:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fdin, "%d", &book); ^