IDENTIFICATION DIVISION.
PROGRAM-ID. SAMPLE.
ENVIRONMENT DIVISION.
DATA DIVISION.
WORKING-STORAGE SECTION.
77 n PIC Z9 .
PROCEDURE DIVISION.
ACCEPT n
PERFORM UNTIL n = 42
compute r = 2**n
display n
ACCEPT n
END-PERFORM.
STOP RUN.
CUlERU5USUZJQ0FUSU9OIERJVklTSU9OLgoJUFJPR1JBTS1JRC4gU0FNUExFLgoKCUVOVklST05NRU5UIERJVklTSU9OLgoKCURBVEEgRElWSVNJT04uCglXT1JLSU5HLVNUT1JBR0UgU0VDVElPTi4KCTc3IG4gUElDIFo5IC4KCglQUk9DRURVUkUgRElWSVNJT04uCgkJQUNDRVBUIG4KCQlQRVJGT1JNIFVOVElMIG4gPSA0MgogICAgY29tcHV0ZSByID0gMioqbgogICAgZGlzcGxheSBuCgkJCUFDQ0VQVCBuCgkJRU5ELVBFUkZPUk0uCgkJU1RPUCBSVU4uCg==
prog.cbl: 13: error: Invalid argument expecting variable, on or before 'r'
prog.cbl: 14: error: undefined variable R, on or before 'display'