User`s guide

Unconditional Branch Instructions
There are three unconditional branching instructions in V+:
l GOTO
l CALL
l CALLS
GOTO
The GOTO instruction causes program execution to branch immediately to a program label
instruction somewhere else in the program. The syntax for GOTO is:
GOTO label
label is an integer entered at the beginning of a line of program code. label is
not the same as the program step numbers: Step numbers are assigned
by the system; labels are entered by the programmer as the opening to a
line of code. In the next code example, the numbers in the first column
are program step numbers (these numbers are not displayed in the SEE
editor). The numbers in the second column are program labels.
61 .
62 GOTO 100
63 .
64 .
65 100 TYPE "The instruction GOTO 100 got me he re."
66 .
A GOTO instruction can branch to a label before or after the GOTO instruction.
GOTO instructions can make program logic difficult to follow and debug, especially in a long,
complicated program with many subroutine calls. Use GOTO instructions with care. A
common use of GOTO is as an exit routine or exit on error instruction.
CALL
The CALL and CALLS instructions are used in V+ to implement subroutine calls. The CALL
instruction causes program execution to be suspended and execution of a new program to
begin. When the new program has completed execution, execution of the original program
resumes at the instruction after the CALL instruction. The details of subroutine creation,
execution, and parameter passing are covered in Subroutines on page 42. The simplified
syntax for a CALL instruction is:
CALL program(arg_list)
program is the name of the program to be called. The program name must be
specified exactly, and the program being CALLed must be resident in
system memory.
Unconditional Branch Instructions
V+Language User's Guide, v17.0
Page 120