Development C

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#include 
#include 
int main(int argc, char *argv[])
{
  double pounds;
  if(argc!=2) {
    printf("Usage: CONVERT \n");
    printf("Try Again");
  }
  else {
    pounds = atof(argv[1]) / 16.0;
    printf("%f pounds", pounds);
  }
  return 0;
}