It should work. Try using https://docs.mql4.com/common/print and compare the results.

Print - Common Functions - MQL4 Reference
- docs.mql4.com
Data of double type are shown with the accuracy of up to 16 digits after a decimal point, and can be output either in traditional or in scientific format, depending on what entry will be more compact. Data of float type are output with 5 digits after a decimal point. To output real numbers with another accuracy or in a predefined format, use...
DavidHuynh:
for example, I'm running an indicator in tester mode on GBPUSD pair. I would like to know how to get RSI value of USDJPY pair?. I've tried iRSI("USDJPY",0,14,PRICE_CLOSE,i), it's not working properly.
Thanks!
Try this.
double RSI_Close=iRSI("USDJPY",0,14,PRICE_CLOSE,0);
On MT4: Unless the current chart is that specific pair/TF referenced, you must handle
4066/4073 errors.
Download history in MQL4 EA - MQL4 and MetaTrader 4 - MQL4 programming forum
Download history in MQL4 EA - MQL4 and MetaTrader 4 - MQL4 programming forum

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for example, I'm running an indicator in tester mode on GBPUSD pair. I would like to know how to get RSI value of USDJPY pair?. I've tried iRSI("USDJPY",0,14,PRICE_CLOSE,i), it's not working properly.
Thanks!