Default-initialize number mantissa to zero

src/CalcManager/Ratpack/conv.cpp

@@ -185,7 +185,7 @@ NUMBER _createnum( _In_ uint32_t size )
 {
     NUMBER num = NUMBER();
     // Fill mantissa vector with zeros
-    num.mant.insert(num.mant.end(), size, 0);
+    num.mant.insert(num.mant.end(), size - 1, 0);
     return( num );
 }
 

src/CalcManager/Ratpack/ratpak.h

@@ -61,7 +61,7 @@ typedef struct _number
                     // radix being used.
     int32_t exp;       // The offset of digits from the radix point
                     // (decimal point in radix 10)
-    std::vector<MANTTYPE> mant;
+    std::vector<MANTTYPE> mant = {0};
 } NUMBER;