added cuda lexer and removed example from c++ samples

samples/Cuda/vectorAdd.cu

@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <cuda_runtime.h>
+
+/**
+ * CUDA Kernel Device code
+ *
+ * Computes the vector addition of A and B into C. The 3 vectors have the same
+ * number of elements numElements.
+ */
+__global__ void
+vectorAdd(const float *A, const float *B, float *C, int numElements)
+{
+    int i = blockDim.x * blockIdx.x + threadIdx.x;
+
+    if (i < numElements)
+    {
+        C[i] = A[i] + B[i];
+    }
+}
+
+/**
+ * Host main routine
+ */
+int
+main(void)
+{
+    // Error code to check return values for CUDA calls
+    cudaError_t err = cudaSuccess;
+
+    // Launch the Vector Add CUDA Kernel
+    int threadsPerBlock = 256;
+    int blocksPerGrid =(numElements + threadsPerBlock - 1) / threadsPerBlock;
+    vectorAdd<<<blocksPerGrid, threadsPerBlock>>>(d_A, d_B, d_C, numElements);
+    err = cudaGetLastError();
+
+    if (err != cudaSuccess)
+    {
+        fprintf(stderr, "Failed to launch vectorAdd kernel (error code %s)!\n", cudaGetErrorString(err));
+        exit(EXIT_FAILURE);
+    }
+
+    // Reset the device and exit
+    err = cudaDeviceReset();
+
+    return 0;
+}