c如何输出高精度浮点型数

int main(int argc, char const *argv[])
{
    long double ld=1.23L;
    printf("1%Lf\n",ld);
    double d=1.3456789123;
    printf("2%f\n",d);
    printf("3%lf\n",d);
    printf("4%llf\n",d);
    long double ld2=(long double)1.3456789123L;
    printf("5%f\n",ld2);
    printf("6%lf\n",ld2);
    printf("7%Lf\n",ld2);
    printf("8%llf\n",ld2);
    printf("9%f\n",(1.3456789123L));
    printf("0%lf\n",1.3456789123L);
    printf("1%Lf\n",1.3456789123L);
    printf("1%.15Lf\n",1.3456789123L);
    printf("2%llf\n",1.3456789123L);
    printf("3%.10f\n",1.3456789123L);
    printf("4%lf\n",1.3456789123L);//Lf 
    printf("5%.15Lf\n",1.3456789123L);
    printf("6%llf\n",1.3456789123L);//  llf不行
    long double x = 1.3456789123;
    printf("7%.15Lf\n", x);
    printf("%.15Lf %d %d %d %d\n",ld,sizeof(ld),sizeof(1e-7L),sizeof((long double)1e-7),sizeof(1e-7));
    return 0;
}