Compilare: user.cpp: In function ‘int main()’: user.cpp:34:24: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 3 has type ‘long long int’ [-Wformat=] fprintf(g,"%ul",k*k); ^ user.cpp:31:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^