pattern for an error

hi everyone,
i have to redesign a peace of code with a lot of GOTOs
looks like that

start.
perform something
perform something_else
perform anything
perform anything_else
...
.

something.
do_something
if (x>10)
error occurs
go to error
end-if
do_something_else
if (y=z)
error occurs
go to error
end-if
.

error.
write error msg
.
ende.
exit program.


so as u maybe see in any paragraph there are exit conditions when the
program should stop and write error massage
my problem now: is there any style guide or pattern to make that in a
clean way WITHOUT goto because i have to transfair it into an acu code
without goto.
the only way i´m thinking is to give a intern retern key after any
paragraph but code would look very confusing right??

kind regards
.

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