function and scope

Author: ivanbrennan

prog.8.8.c

@@ -0,0 +1,32 @@
+// Function to calculate the absolute value of a number
+
+#include <stdio.h>
+
+float absoluteValue (float x)
+{
+	if ( x < 0 )
+		x = -x;
+	return (x);
+}
+
+// Function to compute the square root of a number
+
+float squareRoot (float x)
+{
+	const float	epsilon	= .00001;
+	float		guess	= 1.0;
+
+	while ( absoluteValue (guess * guess - x) >= epsilon )
+		guess = ( x / guess + guess ) / 2.0;
+
+	return guess;
+}
+
+int main (void)
+{
+	printf ("squareRoot (2.0) = %f\n", squareRoot (2.0));
+	printf ("squareRoot (144.0) = %f\n", squareRoot (144.0));
+	printf ("squareRoot (17.5) = %f\n", squareRoot (17.5));
+
+	return 0;
+}