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Explore Stack Internal##QBIC, 10 bytes
:{?a~a|\_X Explanation:
: Reads a number from the command line and names it 'a' { DO - infinite loop ?a Print 'a' ~a IF 'a': 0 is seen as false, 1 as true | THEN: Empty THEN block, we want to act on FALSE \_X ELSE exit the program. _X accepts one implicit parameter, and prints that parameter on exit. Since no parameter is given, nothing gets printed. [IF and DO are implicitly closed by QBIC] ##QBIC, 10 bytes
:{?a~a|\_X Explanation:
: Reads a number from the command line and names it 'a' { DO - infinite loop ?a Print 'a' ~a IF 'a': 0 is seen as false, 1 as true | THEN: Empty THEN block, we want to act on FALSE \_X ELSE exit the program. _X accepts one implicit parameter, and prints that parameter on exit. Since no parameter is given, nothing gets printed. [IF and DO are implicitly closed by QBIC] :{?a~a|\_X Explanation:
: Reads a number from the command line and names it 'a' { DO - infinite loop ?a Print 'a' ~a IF 'a': 0 is seen as false, 1 as true | THEN: Empty THEN block, we want to act on FALSE \_X ELSE exit the program. _X accepts one implicit parameter, and prints that parameter on exit. Since no parameter is given, nothing gets printed. [IF and DO are implicitly closed by QBIC] ##QBIC, 10 bytes
:{?a~a|\_X Explanation:
: Reads a number from the command line and names it 'a' { DO - infinite loop ?a Print 'a' ~a IF 'a': 0 is seen as false, 1 as true | THEN: Empty THEN block, we want to act on FALSE \_X ELSE exit the program. _X accepts one implicit parameter, and prints that parameter on exit. Since no parameter is given, nothing gets printed. [IF and DO are implicitly closed by QBIC]