Compilare: user.cpp: In function ‘int main()’: user.cpp:18:20: warning: unused variable ‘j’ [-Wunused-variable] int ni,nz,cf,i,j; ^ user.cpp:20:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&ni,&nz); ^ user.cpp:22:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&cf); ^