Compilare: user.cpp: In function ‘int main()’: user.cpp:49:25: warning: left operand of comma operator has no effect [-Wunused-value] for(j=a-nr-m+1,i=a-m+1;j<=a-m,i<=a;i++,j++) ^ user.cpp:39:21: warning: unused variable ‘mn’ [-Wunused-variable] long double mn=1; ^ user.cpp:40:13: warning: variable ‘c’ set but not used [-Wunused-but-set-variable] int c=0; ^ user.cpp:49:8: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(j=a-nr-m+1,i=a-m+1;j<=a-m,i<=a;i++,j++) ^