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29 lines
667 B
29 lines
667 B
#include <math.h>
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#include <stdio.h>
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#include <errno.h>
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/* Ref. a.o. http://www.ansic.net/showlog.php?id=31&res=log%20function */
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int
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main(int argc, char **argv)
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{
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double a, b;
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a = INFINITY;
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b = log(a);
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printf("log(%3f)\t\t= %5f errno=%2d (expected: inf / %d)\n", a, b, errno, 0);
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a = -INFINITY;
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b = log(a);
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printf("log(%3f)\t\t= %5f errno=%2d (expected: nan / %d)\n", a, b, errno, EDOM);
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a = -1;
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b = log(a);
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printf("log(%3f)\t\t= %5f errno=%2d (expected: nan / %d)\n", a, b, errno, EDOM);
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a = NAN;
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b = log(a);
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printf("log(%3f)\t\t= %5f errno=%2d (expected: nan / %d)\n", a, b, errno, EDOM);
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return 0;
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}
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