CMake/Tests/Tutorial/Step5/MathFunctions/MakeTable.cxx

// A simple program that builds a sqrt table
#include <math.h>
#include <stdio.h>

int main(int argc, char* argv[])
{
  int i;
  double result;

  // make sure we have enough arguments
  if (argc < 2) {
    return 1;
  }

  // open the output file
  FILE* fout = fopen(argv[1], "w");
  if (!fout) {
    return 1;
  }

  // create a source file with a table of square roots
  fprintf(fout, "double sqrtTable[] = {\n");
  for (i = 0; i < 10; ++i) {
    result = sqrt(static_cast<double>(i));
    fprintf(fout, "%g,\n", result);
  }

  // close the table with a zero
  fprintf(fout, "0};\n");
  fclose(fout);
  return 0;
}