Microsoft Windows [Version 10.0.16299.726]
(c) 2017 Microsoft Corporation. All rights reserved.

C:\Users\anandr1x>cd..//..//

C:\>cd intelFPGA\17.1\hls

C:\intelFPGA\17.1\hls>init_hls.bat
Assuming current directory (C:\intelFPGA\17.1\hls\) is root of i++

Will use C:\intelFPGA\17.1\hls\..\quartus to find Quartus
 for internal i++ use
INFO: Could not find files for the given pattern(s).
Will be using Modelsim at C:\intelFPGA\17.0\modelsim_ae\win32aloem\
Will be using Modelsim at C:\intelFPGA\17.0\modelsim_ase\win32aloem\
Will be using Modelsim at C:\intelFPGA_pro\18.0\modelsim_ase\win32aloem\
Will be using Modelsim at C:\intelFPGA_pro\18.0\modelsim_ae\win32aloem\
Will be using Modelsim at C:\intelFPGA_lite\18.1\modelsim_ase\win32aloem\
Will be using Modelsim at C:\intelFPGA\17.1\modelsim_ase\win32aloem\

VisualStudio's link.exe is not on the path. Guessing its location.
VS100COMNTOOLS environment variable is set to C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\Tools\.
Looks like you have VisualStudio2010 installed. Using it.
Setting environment for using Microsoft Visual Studio 2010 x64 tools.

Adding C:\intelFPGA\17.1\hls\bin to PATH
Adding C:\intelFPGA\17.1\hls\host\windows64\bin to PATH
C:\intelFPGA\17.1\hls>cd ..//..//

C:\intelFPGA>cd..

C:\>cd Users\anandr1x\Desktop\hls\add\

C:\Users\anandr1x\Desktop\hls\add>build.bat test-x86-64
i++  -march=x86-64 add.cpp -o test-x86-64.exe
Run test-x86-64.exe to execute the test.

C:\Users\anandr1x\Desktop\hls\add>build.bat test-fpga
i++  -march=CycloneV add.cpp -o test-fpga.exe
test-fpga.exe : warning LNK4088: image being generated due to /FORCE option; image may not run
Run test-fpga.exe to execute the test.

C:\Users\anandr1x\Desktop\hls\add>