Compilare: user.cpp: In function ‘int main()’: user.cpp:2:34: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘int’ [-Wformat=] #define pf(x) fprintf(f2,"%ld ",x) ^ user.cpp:18:5: note: in expansion of macro ‘pf’ pf(1); ^ user.cpp:9:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%ld",&an); ^