Implemented math.h

libc/math/pow.c

@@ -0,0 +1,42 @@
+#include <math.h>
+
+#define _POW_LOOP_MAX   60
+
+double sqrt(double x) {
+    if (x < 0.0) return -NAN;
+
+    double result = x;
+    double oldResult = 0.0;
+
+    while (result != oldResult) {
+        oldResult = result;
+        result = 0.5 * (result + x/result);
+    }
+
+    return result;
+}
+
+double cbrt(double x) {
+    double result = x;
+    double oldResult = 0.0;
+
+    while (result != oldResult) {
+        oldResult = result;
+        result = (2.0 * result + x/(result * result)) / 3.0;
+    }
+
+    return result;
+}
+
+double hypot(double x, double y) {
+    return sqrt(x*x + y*y);
+}
+
+double pow(double base, double expn) { // exp is a function so we have to use expn
+    if (base == 0.0 && expn == 0.0) return NAN;
+    if (base == 0.0) return 0.0;
+    if (expn == 0.0) return 1.0;
+
+    return exp(expn * log(base));
+}
+