c function in WinCC

there is a problem with a c function written for wincc. it dosent matter waths the sourcecode about after a special number of
commands i get a general protection fault.
eg. for(x=0;x<1000;x++){printf("%d", x);} runs fine.
but something like this
printf("%d" x); x++; printf("%d" x); x++; printf("%d" x); x++; . . (1000 times) .
generates a protection fault during execution.
anybody an idea?
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