Compilare: user.cpp: In function ‘int main()’: user.cpp:18:23: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long long int’ [-Wformat=] fprintf(out,"%d",a); ^ user.cpp:9:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%lld %lld",&a,&b); ^