21 lines
388 B
C
21 lines
388 B
C
#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <ctype.h>
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#define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
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#define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
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#define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
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int
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main()
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{
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int i;
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for (i = 0; i < 256; i++) {
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if (XOR(islower(i), ISLOWER(i)) || toupper(i) != TOUPPER(i))
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return 2;
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}
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return 0;
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}
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