#include <stdio.h>

int main ()
{
  // Constant with "F" appended:
  float PI = 3.141F;

  // Constant in exponent format:
  double doublePI = 314.159265E-2;

  // Long double constant:
  long double ldoublePI = 3.14159265358979L;

  // Output in exponent format:
  printf ("float PI = %7.5e\n", PI);

  // Output in decimal format with field width and number of significant digits:
  printf ("double PI = %16.10lf\n", doublePI);

  // Long double's need to be printed as double's
  printf ("long double PI = %15.12lf\n", (double) ldoublePI);
}