Как вывести ноль перед числом?

std::cout<<std::dec<<std::setw(2)<<std::setfill('0');
std::cout<<x<<y<<z<<t<<r<<std::endl;
std::cout<<d<<f<<r<<e<<s<<std::endl;
std::cout<<w<<i<<q<<p<<v<<std::endl;
std::cout<<l<<k<<c<<v<<y<<std::endl;
std::cout<<u<<i<<g<<h<<j<<std::endl;
std::cout<<a<<b<<n<<m<<e1<<std::endl;

printf("%02d%02d%02d%02d%02d\n",x,y,z,t,r);
printf("%02d%02d%02d%02d%02d\n",d,f,r,e,s);
printf("%02d%02d%02d%02d%02d\n",w,i,q,p,y);
printf("%02d%02d%02d%02d%02d\n",l,k,c,v,y);
printf("%02d%02d%02d%02d%02d\n",u,c2,g,h,j);
printf("%02d%02d%02d%02d%02d\n",a,b,n,m,el);

std::cout<<std::dec<<std::setw(2)<<std::setfill('0');
std::cout<<a1<<a2<<a3<<a4<<a5<<std::endl;
std::cout<<b1<<b2<<b3<<b4<<b5<<std::endl;
std::cout<<c1<<c2<<c3<<c4<<c5<<std::endl;
std::cout<<d1<<d2<<d3<<d4<<d5<<std::endl;
std::cout<<e1<<e2<<e3<<e4<<e5<<std::endl;
std::cout<<f1<<f2<<f3<<f4<<f5<<std::endl;
std::cout<<g1<<g2<<g3<<g4<<g5<<std::endl;
std::cout<<h1<<h2<<h3<<h4<<h5<<std::endl;
std::cout<<i1<<i2<<i3<<i4<<i5<<std::endl;
std::cout<<j1<<j2<<j3<<j4<<j5<<std::endl;
std::cout<<k1<<k2<<k3<<k4<<k5<<std::endl;
std::cout<<l1<<l2<<l3<<l4<<l5<<std::endl;

printf("%02d%02d%02d%02d%02d\n",a1,a2,a3,a4,a5);
printf("%02d%02d%02d%02d%02d\n",b1,b2,b3,b4,b5);
printf("%02d%02d%02d%02d%02d\n",c1,c2,c3,c4,c5);
printf("%02d%02d%02d%02d%02d\n",d1,d2,d3,d4,d5);
printf("%02d%02d%02d%02d%02d\n",e1,e2,e3,e4,e5);
printf("%02d%02d%02d%02d%02d\n",f1,f2,f3,f4,f5);
printf("%02d%02d%02d%02d%02d\n",g1,g2,g3,g4,g5);
printf("%02d%02d%02d%02d%02d\n",h1,h2,h3,h4,h5);
printf("%02d%02d%02d%02d%02d\n",i1,i2,i3,i4,i5);
printf("%02d%02d%02d%02d%02d\n",j1,j2,j3,j4,j5);
printf("%02d%02d%02d%02d%02d\n",k1,k2,k3,k4,k5);
printf("%02d%02d%02d%02d%02d\n",l1,l2,l3,l4,l5);

cout<<(!(h/10)?"0":"")<<h;