how to tell if cuda is working code example

Example 1: how to check cuda version

nvcc --version

Example 2: check if cuda installed

# nvcc -V
 nvcc: NVIDIA (R) Cuda compiler driver
 Copyright (c) 2005-2015 NVIDIA Corporation
 Built on Tue_Aug_11_14:31:50_CDT_2015
 Cuda compilation tools, release 7.5, V7.5.17