math/test-math.c

   1 #include <ansidecl.h>
   2 #include <stdio.h>
   3 #include <math.h>
   4 #include <stdlib.h>
   5 #include <errno.h>
   6 #include <string.h>
   7
   8 void print_trig_stuff __P ((void));
   9
  10 int
  11 DEFUN_VOID(main)
  12 {
  13   CONST char str[] = "123.456";
  14   double x,h,li,lr,a,lrr;
  15
  16   x = atof (str);
  17
  18   printf ("%g %g\n", x, pow (10.0, 3.0));
  19
  20   x = sinh(2.0);
  21
  22   printf("sinh(2.0) = %g\n", x);
  23
  24   x = sinh(3.0);
  25
  26   printf("sinh(3.0) = %g\n", x);
  27
  28   h = hypot(2.0,3.0);
  29
  30   printf("h=%g\n", h);
  31
  32   a = atan2(3.0, 2.0);
  33
  34   printf("atan2(3,2) = %g\n", a);
  35
  36   lr = pow(h,4.0);
  37
  38   printf("pow(%g,4.0) = %g\n", h, lr);
  39
  40   lrr = lr;
  41
  42   li = 4.0 * a;
  43
  44   lr = lr / exp(a*5.0);
  45
  46   printf("%g / exp(%g * 5) = %g\n", lrr, a, lr);
  47
  48   lrr = li;
  49
  50   li += 5.0 * log(h);
  51
  52   printf("%g + 5*log(%g) = %g\n", lrr, h, li);
  53
  54   printf("cos(%g) = %g,  sin(%g) = %g\n", li, cos(li), li, sin(li));
  55
  56   x = drem(10.3435,6.2831852);
  57
  58   printf("drem(10.3435,6.2831852) = %g\n", x);
  59
  60   x = drem(-10.3435,6.2831852);
  61
  62   printf("drem(-10.3435,6.2831852) = %g\n", x);
  63
  64   x = drem(-10.3435,-6.2831852);
  65
  66   printf("drem(-10.3435,-6.2831852) = %g\n", x);
  67
  68   x = drem(10.3435,-6.2831852);
  69
  70   printf("drem(10.3435,-6.2831852) = %g\n", x);
  71
  72
  73   printf("x%8.6gx\n", .5);
  74   printf("x%-8.6gx\n", .5);
  75   printf("x%6.6gx\n", .5);
  76
  77   {
  78     double x = atof ("-1e-17-");
  79     printf ("%g %c= %g %s!\n",
  80             x,
  81             x == -1e-17 ? '=' : '!',
  82             -1e-17,
  83             x == -1e-17 ? "Worked" : "Failed");
  84   }
  85
  86   print_trig_stuff ();
  87
  88   return 0;
  89 }
  90 \f
  91
  92 #define PI 3.14159265358979323846264338327
  93
  94 const double RAD[5] = { 0, PI/2, PI, (3*PI)/2, 2*PI };
  95 const int    DEG[5] = { 0, 90, 180, 360 };
  96
  97 #define PRINT_IT_1_ARG(_func, _arg, _value) \
  98     (_value) = (_func)((_arg)); \
  99     if (errno) { \
 100       errno = 0; \
 101       printf("%s = ERROR %s\n", #_func, strerror(errno)); \
 102     } else \
 103       printf("%s(%g) = %g\n", #_func, _arg, (_value)); \
 104
 105 #define PRINT_IT_2_ARG(_func, _arg1, _arg2, _value) \
 106     (_value) = (_func)((_arg1),(_arg2)); \
 107     if (errno) { \
 108       errno = 0; \
 109       printf("%s = ERROR %s\n", #_func, strerror(errno)); \
 110     } else \
 111       printf("%s(%g, %g) = %g\n", #_func, _arg1, _arg2, (_value)); \
 112
 113 void
 114 DEFUN_VOID (print_trig_stuff)
 115 {
 116   double value, arg1, arg2;
 117   int i;
 118
 119   puts ("\n\nMath Test");
 120
 121   errno = 0;                    /* automatically reset on error condition */
 122   for (i=0; i<4; i++)
 123     {
 124       PRINT_IT_1_ARG (sin, RAD[i], value);
 125       PRINT_IT_1_ARG (cos, RAD[i], value);
 126       PRINT_IT_1_ARG (tan, RAD[i], value);
 127       PRINT_IT_1_ARG (asin, RAD[i], value);
 128       PRINT_IT_1_ARG (acos, RAD[i], value);
 129       PRINT_IT_1_ARG (atan, RAD[i], value);
 130       PRINT_IT_2_ARG (atan2, RAD[i], -RAD[i % 4], value);
 131     }
 132
 133   arg1 = 16;
 134   arg2 = 3;
 135   PRINT_IT_1_ARG (exp, arg1, value);
 136   PRINT_IT_1_ARG (log, arg1, value);
 137   PRINT_IT_1_ARG (log10, arg1, value);
 138   PRINT_IT_2_ARG (pow, arg1, arg2, value);
 139   PRINT_IT_1_ARG (sqrt, arg1, value);
 140   PRINT_IT_1_ARG (cbrt, arg1, value);
 141   PRINT_IT_2_ARG (hypot, arg1, arg2, value);
 142   PRINT_IT_1_ARG (expm1, arg1, value);
 143   PRINT_IT_1_ARG (log1p, arg1, value);
 144   PRINT_IT_1_ARG (sinh, arg1, value);
 145   PRINT_IT_1_ARG (cosh, arg1, value);
 146   PRINT_IT_1_ARG (tanh, arg1, value);
 147   PRINT_IT_1_ARG (asinh, arg1, value);
 148   PRINT_IT_1_ARG (acosh, arg1, value);
 149   PRINT_IT_1_ARG (atanh, arg1, value);
 150 }