set_float_data.cpp

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <string>
#include <stdexcept>
#include <cassert> 

template <typename T>
static void dumpBufferToFile(const char* fileName, T* data, size_t dataNumItems)
{
    std::ofstream outFile(fileName, std::ios::binary);
    if(outFile)
    {
        outFile.write(reinterpret_cast<char*>(data), dataNumItems * sizeof(T));
        outFile.close();
        printf("Wrote output to file %s\n", fileName);
    }
    else
    {
        printf("Could not open file %s for writing\n", fileName);
    }
}

int main(int argc, char *argv[])
{
     if ( argc != 4 ) {
          std::cerr << "Usage: " << argv[0] << " <file> <number of elements> <value>" << std::endl; 

	  throw std::runtime_error("Invalid command argument!"); 
     }; 

     int numElements = atoi(argv[2]); 
     float value = static_cast<float>(atof(argv[3])); 

     assert( numElements > 0 ); 

     float *dataBuffer = new float[numElements]; 

     for (int i=0; i < numElements; i++)
	  dataBuffer[i] = value; 

     dumpBufferToFile(argv[1], dataBuffer, numElements); 
};