addition reading precision out of double numbers

src/addition.c

@@ -115,3 +115,8 @@ unsigned long sign_double(unsigned long a) {
     if (a & 0x8000000000000000 == 0x8000000000000000) return 1;
     else return 0;
 }
+
+unsigned long precision_double(unsigned long a) {
+    a &= 0x000fffffffffffff;
+    return a;
+}

src/addition.h

@@ -25,4 +25,6 @@ float addition_float(float number1, float number2);
 
 unsigned long sign_double(unsigned long a);
 
+unsigned long precision_double(unsigned long a);
+
 #endif // ADDITION_H