Compilare: main.cpp: In function 'int main()': main.cpp:58:29: warning: unused variable 'valD' [-Wunused-variable] long i,j,nr=0,ng=0,nb=0,valD,z,xv,yv,in,sf,k=0,maxk=-1; ^~~~ main.cpp:58:42: warning: variable 'in' set but not used [-Wunused-but-set-variable] long i,j,nr=0,ng=0,nb=0,valD,z,xv,yv,in,sf,k=0,maxk=-1; ^~ main.cpp:58:45: warning: variable 'sf' set but not used [-Wunused-but-set-variable] long i,j,nr=0,ng=0,nb=0,valD,z,xv,yv,in,sf,k=0,maxk=-1; ^~