Compilare: user.cpp: In function ‘int main()’: user.cpp:9:20: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable] int a[17][17],i,j,ret,aux,row=0,col=0,sum_poz,sum_neg,m,n; ^ user.cpp:13:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,m*n*sizeof(int),1,in); ^