Changing the order of execution: goto, label

### 11.3.8 Changing the order of execution: goto, label

The goto command will tell a program to jump to a different spot in a program, where the spot needs to have been marked with label. They both must have the same argument, which is simply a sequence of characters. For example, the following program will add the terms of the harmonic series until the term is less than some specified value eps and print the result.

      harmsum(eps) := {
      local S, j;
      S := 0;
      j := 0;
      label(spot);
      j := j + 1;
      S := S + 1/j;
      if (1/j >= eps) goto (spot);
      print(S);
      return 0;
      }