how to printf long double in C? [duplicate]

Question

[Update] The results would still be the same no matter I use lf, Lf, llf...I am using Code Blocks to compile and run my C program. I am using GNU GCC compiler.

I tried to printf long double float type on different computers including two Windows and one Mac but it turns out that none of them is working as I expected. The code is the following:

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

int main()
{
    double d = 6.232345235;   //8 bytes
    long double ld = 5.5767458458;

    printf("%lf\n", ld);
    return 0;
}

Either the return value is -0.000000 or another very huge negative number which I don't remember now.

Any help is greatly appreciated! :D

Answer 1

The right format specifier for long double in printf() is "%Lf"