Get amount with required exchange rate of currency

Scenario:- When you need to get amount with required exchange rate.

Case :- It also depends on whether we are going with Account currency exchange rate or Budget exchange rate type as shown in image below 

Case 1:- If it is Budget exchange

Code:-

CurrencyCode            currencyCode = SystemParameters::find().SystemCurrencyCode;
            str fromcurrency='USD';
            str tocurrency='CAD';
            real amount=120;
            CurrencyExchangeHelper  currencyExchangeHelper;
            currencyExchangeHelper = currencyExchangeHelper::construct();
            currencyExchangeHelper.parmLedgerRecId(Ledger::current());
            currencyExchangeHelper.parmExchangeRateTypeRecId(Ledger::budgetExchangeRateType());
            Info(strFmt("%1",currencyExchangeHelper.calculateCurrencyToCurrency(fromcurrency, tocurrency,amount, true)));

Case 2:- If it is Account currency exchange rate

Code:-

CurrencyCode            currencyCode = SystemParameters::find().SystemCurrencyCode;
            str fromcurrency='USD';
            str tocurrency='CAD';
            real amount=120;
            CurrencyExchangeHelper  currencyExchangeHelper;
            currencyExchangeHelper = currencyExchangeHelper::construct();
            currencyExchangeHelper.parmLedgerRecId(Ledger::current());
            currencyExchangeHelper.parmExchangeRateTypeRecId(Ledger::defaultExchangeRateType());
            Info(strFmt("%1",currencyExchangeHelper.calculateCurrencyToCurrency(fromcurrency, tocurrency,amount, true)));