use integer division instead of double conversion and multiplication for computing amounts

src/validation.h

@@ -53,9 +53,9 @@ static const bool DEFAULT_WHITELISTFORCERELAY = true;
 /** Default for -minrelaytxfee, minimum relay fee for transactions */
 static const unsigned int DEFAULT_MIN_RELAY_TX_FEE = 1000;
 //! -maxtxfee default
-static const CAmount DEFAULT_TRANSACTION_MAXFEE = 0.1 * COIN;
+static const CAmount DEFAULT_TRANSACTION_MAXFEE = COIN / 10;
 //! Discourage users to set fees higher than this amount (in satoshis) per kB
-static const CAmount HIGH_TX_FEE_PER_KB = 0.01 * COIN;
+static const CAmount HIGH_TX_FEE_PER_KB = COIN / 100;
 //! -maxtxfee will warn if called with a higher fee than this amount (in satoshis)
 static const CAmount HIGH_MAX_TX_FEE = 100 * HIGH_TX_FEE_PER_KB;
 /** Default for -limitancestorcount, max number of in-mempool ancestors */