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C/C++ Source or Header  |  1991-08-05  |  388 b   |  18 lines
  1. /* log.c function from p. 221 of turbo c bible */
  2. #include<stdio.h>
  3. #include<math.h>
  4. #include<stdlib.h>            /* errno is declared here */
  5. main(int argc, char **argv)
  6. {
  7.     double result;
  8.     if(argc < 2)
  9.     {
  10.         printf("Usage: %s <value>\n", argv[0]);
  11.     }
  12.     else
  13.     {
  14.         result = log(atof(argv[1]));
  15.         if(errno != EDOM && errno !=ERANGE)
  16.             printf("log(%s) = %f\n",argv[1], result);
  17.     }
  18. }