c - C の long double の書式指定子 %Lf が期待どおりに機能しない

Question

C の基本をオンライン ビデオで学習しているときに、作成者は以下のコードを共有して、float、double、long double の違いを見つけました。このプログラムは、64 ビットの Windows 10 ラップトップで実行されている Eclispse で実行しました。

#include <stdio.h>
#include <stdlib.h>

int main(void) {
puts("Floating point type usage in C:");

// Floating point types
float           floatNumber;
double          doubleNumber;
long double     longDoubleNumber;

// Size of floating point types
//lu - Stands for "unsigned decimal integer" and "long"
printf("Storage size for unsigned float : %lu  bytes \n", sizeof(float));
printf("Storage size for double :         %lu  bytes \n", sizeof(double));
printf("Storage size for long double :   %lu  bytes \n", sizeof(long double));

floatNumber = 2.0/3.0;
doubleNumber = 2.0/3.0;
longDoubleNumber = 2.0/3.0;

puts("\nCompare precision at 4 decimal points:");
printf("floatNumber      = %1.4f\n", floatNumber);
printf("doubleNumber     = %1.4lf\n", doubleNumber);
printf("longDoubleNumber = %1.4Lf\n", longDoubleNumber);

puts("\nCompare precision at 10 decimal points:");
printf("floatNumber      = %1.10f\n", floatNumber);
printf("doubleNumber     = %1.10lf\n", doubleNumber);
printf("longDoubleNumber = %1.10Lf\n", longDoubleNumber);

puts("\nCompare precision at 30 decimal points:");
printf("floatNumber      = %1.30f\n", floatNumber);
printf("doubleNumber     = %1.30lf\n", doubleNumber);
printf("longDoubleNumber = %1.30g\n", longDoubleNumber);
return 0;
}

どういうわけか、期待される出力が得られません。Eclipse コンソールで取得した出力を追加しました。誰が何が悪かったのかを理解するのを手伝ってくれますか

Floating point type usage in C:
Storage size for unsigned float : 4  bytes 
Storage size for double :         8  bytes 
Storage size for long double :   16  bytes 

Compare precision at 4 decimal points:
floatNumber      = 0.6667
doubleNumber     = 0.6667
longDoubleNumber = 0.0000              //Expected value = 0.6667

Compare precision at 10 decimal points:
floatNumber      = 0.6666666865
doubleNumber     = 0.6666666667
longDoubleNumber = 0.0000000000   //Expected value = 0.6666666667

Compare precision at 30 decimal points:
floatNumber      = 0.666666686534881590000000000000 
doubleNumber     = 0.666666666666666630000000000000
longDoubleNumber = 3.1728895775924853e-317   //This is not the expected value