Compilare: user.cpp: In function ‘void readdata()’: user.cpp:9:23: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘long int*’ [-Wformat=] fscanf(f,"%d%d",&p); ^ user.cpp:9:23: warning: format ‘%d’ expects a matching ‘int*’ argument [-Wformat=] user.cpp: In function ‘void writedata()’: user.cpp:64:21: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long int’ [-Wformat=] fprintf(f,"%d",n); ^ user.cpp: In function ‘void readdata()’: user.cpp:9:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&p); ^