Compilare: user.cpp: In function ‘void Back(int)’: user.cpp:59:13: warning: unused variable ‘val’ [-Wunused-variable] int val=0; ^ user.cpp: In function ‘int main()’: user.cpp:111:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&X,&N); ^ user.cpp:115:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&Y); ^ user.cpp:120:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&Y); ^