Compilare: user.cpp: In function ‘int main()’: user.cpp:37:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:40:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&b[i]); ^ user.cpp: In function ‘int occupied(int)’: user.cpp:24:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int free(int)’: user.cpp:18:1: warning: control reaches end of non-void function [-Wreturn-type] } ^