Add check for integer exponent

src/exponent.c

@@ -15,9 +15,13 @@ double expI(double e, double num){
 }
 
 double expIN(double e, double num){
+    if(e - ((int) e) < 0.0001 || e - ((int) e) > -0.0001){
         if(e>0){
             return expI(e, num);
-    }else{
+        }
+        else{
             return  (1.0 / expI((e*-1), num));
         }   
+    }
+    return 0;
 }

test/test_exponent.c

@@ -31,9 +31,9 @@ void test_DoubleBase_ForNegativeExponent(void){
     r2 = expIN(-3.0, -3.0);
     r3 = expIN(-2.0, -2.0);
 
-    printf("Result 1: %d\n", r1);
-    printf("Result 2: %d\n", r2);
-    printf("Result 3: %d\n", r3);
+    printf("Result 1: %f\n", r1);
+    printf("Result 2: %f\n", r2);
+    printf("Result 3: %f\n", r3);
 
     TEST_ASSERT_EQUAL_FLOAT(0.5, r1);
     TEST_ASSERT_EQUAL_FLOAT(-0.0370370373, r2);