func[] vadd a[] b[] .
   for i to len a[]
      r[] &= a[i] + b[i]
   .
   return r[]
.
func[] vsub a[] b[] .
   for i to len a[]
      r[] &= a[i] - b[i]
   .
   return r[]
.
func[] vmul a[] b .
   for i to len a[]
      r[] &= a[i] * b
   .
   return r[]
.
func[] vdiv a[] b .
   for i to len a[]
      r[] &= a[i] / b
   .
   return r[]
.
print vadd [ 5 7 ] [ 2 3 ]
print vsub [ 5 7 ] [ 2 3 ]
print vmul [ 5 7 ] 11
print vdiv [ 5 7 ] 2
