Data commit

Task/Extreme-floating-point-values/C/extreme-floating-point-values-1.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+
+int main()
+{
+    double inf = 1/0.0;
+    double minus_inf = -1/0.0;
+    double minus_zero = -1/ inf ;
+    double nan = 0.0/0.0;
+
+    printf("positive infinity: %f\n",inf);
+    printf("negative infinity: %f\n",minus_inf);
+    printf("negative zero: %f\n",minus_zero);
+    printf("not a number: %f\n",nan);
+
+    /* some arithmetic */
+
+    printf("+inf + 2.0 = %f\n",inf + 2.0);
+    printf("+inf - 10.1 = %f\n",inf - 10.1);
+    printf("+inf + -inf = %f\n",inf + minus_inf);
+    printf("0.0 * +inf = %f\n",0.0 * inf);
+    printf("1.0/-0.0 = %f\n",1.0/minus_zero);
+    printf("NaN + 1.0 = %f\n",nan + 1.0);
+    printf("NaN + NaN = %f\n",nan + nan);
+
+    /* some comparisons */
+
+    printf("NaN == NaN = %s\n",nan == nan ? "true" : "false");
+    printf("0.0 == -0.0 = %s\n",0.0 == minus_zero ? "true" : "false");
+
+    return 0;
+}

Task/Extreme-floating-point-values/C/extreme-floating-point-values-2.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <values.h>
+#include <math.h>
+
+char * bits(double v) {
+	static char s[sizeof(double) * (CHARBITS + 1)];
+	int n, i, j;
+	unsigned char *c = (void*)&v;
+	for (i = n = 0; i < sizeof(double); i++) {
+		for (j = 1 << (CHARBITS - 1); j; j >>= 1)
+			s[n++] = (c[i] & j) ? '1' : '.';
+		s[n++] = ' ';
+	}
+	s[n-1] = 0;
+	return s;
+}
+
+int main(void)
+{
+	double x[] = {
+		1.0, -1.0, 1.0/256, 0.0, // "normal" values
+		-0.0, INFINITY, -INFINITY, NAN, -NAN, // special
+		DBL_MAX, DBL_MIN // not required by task
+	};
+	int i;
+
+	for (i = 0; i < sizeof(x) / sizeof(x[0]); i++)
+		printf("%s | %g\n", bits(x[i]), x[i]);
+
+	return 0;
+}