输出浮点值

#include <stdio.h>

int main(void)
{
  float  fp1 = 345.678f,    fp2 = 1.234E6f;
  double fp3 = 234567898.0, fp4 = 11.22334455e-6;

  printf("%f  %+f  %-10.4f  %6.4f/n", fp1, fp2, fp1, fp2);
  printf("%e  %+E/n", fp1, fp2);
  printf("%f  %g  %#+f  %8.4f  %10.4g/n", fp3,fp3, fp3, fp3, fp4);
  return 0;
}