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    <p>This works #include "cuda_runtime.h" #include "device_launch_parameters.h" #include #include #include</p> <pre><code>#define m_CellNum 100 #define CELLMAXPARTICLENUM 10 int numPartilces = 10; extern void Initialize(); __device__ struct CCell { int m_CellParticleNumber ; int m_aCellParticleID[CELLMAXPARTICLENUM]; } ; CCell* hvalue; CCell* dvalue; int* dCellParticleID; __constant__ CCell * c_value; // #define VALUE "c_value" __global__ void Sum_constant(CCell* value, int N) { int index; index = blockIdx.x * blockDim.x + threadIdx.x; if (index&gt;=100) return; for(int idx=0;idx&lt;10 ;++idx) value[index].m_aCellParticleID[idx]= value[index].m_aCellParticleID[idx]+ c_value[index].m_aCellParticleID[idx] ; //return; } int main() { int numPartilces = 10; hvalue = new CCell[m_CellNum]; cudaMalloc((void**)&amp;dvalue,m_CellNum * sizeof(CCell)); //calling function to initialize the value Initialize(); //initializing the device momory cudaMemcpy(dvalue, hvalue, sizeof(CCell)*m_CellNum,cudaMemcpyHostToDevice); //copying value to constant memory cudaMemcpyToSymbol(c_value, &amp;dvalue, sizeof(dvalue)); //dividing bolcks and grid int block_size = 4; int n_blocks = m_CellNum/block_size + (m_CellNum%block_size == 0 ? 0:1); //invocking kernel function Sum_constant &lt;&lt;&lt; n_blocks, block_size &gt;&gt;&gt; (dvalue,m_CellNum); //copying value from host to device cudaMemcpy(hvalue, dvalue,m_CellNum * sizeof(CCell),cudaMemcpyDeviceToHost); //showing result for(int i = 0; i &lt; 100; ++i) { std::cout&lt;&lt; "i=" &lt;&lt; i&lt;&lt;std::endl ; for(int j = 0; j &lt;numPartilces ; ++j) { std::cout&lt;&lt;hvalue[i].m_aCellParticleID[j]&lt;&lt;"\n"; } std::cout&lt;&lt;hvalue[i].m_CellParticleNumber&lt;&lt;"Particle Num"&lt;&lt;std::endl; } free(hvalue); cudaFree(dvalue); cudaFree(c_value); return 0; } void Initialize() { for(int i = 0; i &lt; m_CellNum; ++i) { hvalue[i].m_CellParticleNumber = 0; for(int j = 0; j &lt; numPartilces; ++j) { hvalue[i].m_aCellParticleID[j] = j+2; hvalue[i].m_CellParticleNumber++; } } } </code></pre>
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    1. POCopy array of structure from host to device using constant memory
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    1. USSubash Shrestha
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      1. VTUpMod
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