Compilare: main.cpp: In function 'int main()': main.cpp:7:11: warning: unused variable 'np' [-Wunused-variable] int rez, np, ni; ^~ main.cpp:7:15: warning: unused variable 'ni' [-Wunused-variable] int rez, np, ni; ^~ main.cpp:19:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lu", &c); ^