Add test for decimal exponents

src/exponent.c

@@ -3,6 +3,13 @@
 
 #include "exponent.h"
 
+double absD(double x){
+    if(x<0){
+        return -1 * x;
+    }
+    return x;
+}
+
 double expI(double e, double num){
     double prod = 1.0;
     if(e==0.0){
@@ -16,16 +23,16 @@ double expI(double e, double num){
 }
 
 double expIN(double e, double num){
-    if(e - ((int) e) < 0.000001 || e - ((int) e) > -0.000001){
-        if(e>0){
+    if(absD(e) - ((int) absD(e)) < 0.000001){
+        if(e>0.0){
             return expI(e, num);
         }
         else{
             return  (1.0 / expI((e*-1), num));
         }   
     }else{
-        if(e>0){
-            return exponential(e*logN(num, 0.000001));
+        if(e>0.0){
+            return exponential(e*logN(num, 0.00000001));
         }
     }
     return 0;
@@ -52,12 +59,7 @@ double exponential(double x){
     return sum;
 }
 
-double absD(double x){
-    if(x<0){
-        return -1 * x;
-    }
-    return x;
-}
+
 
 double logN(double x, double eps){
     if(x <= 0){

test/test_exponent.c

@@ -40,6 +40,22 @@ void test_DoubleBase_ForNegativeExponent(void){
     TEST_ASSERT_EQUAL_FLOAT(0.25, r3);
 }
 
+void test_DoubleBase_for_positive_decimal_exponent(void){
+    float r1, r2, r3;
+
+    r1 = expIN(0.45, 3.0);
+    r2 = expIN(0.5, 9.0);
+    r3 = expIN(0.5, 2.0);
+
+    printf("Result 1: %f\n", r1);
+    printf("Result 2: %f\n", r2);
+    printf("\nResult 3: %lf\n\n", r3);
+
+    TEST_ASSERT_DOUBLE_WITHIN(0.0001, 1.639474, r1);
+    TEST_ASSERT_DOUBLE_WITHIN(0.0001, 3.0, r2);
+    TEST_ASSERT_DOUBLE_WITHIN(0.0001, 1.414213, r3);
+}
+
 void test_Exponent_with_positive_number(void){
     double r1, r2, r3;