Variadic function (va_arg) doesn't work with float?

Question

I have a variadic function which takes a float parameter. Why doesn\'t it work?

va_arg(arg, float)

Answer 1

As @dasblinkenlight has mentioned, float is promoted to double. It works fine for me:

#include           
#include 

void foo(int n, ...)
{   
    va_list vl;
    va_start(vl, n);

    int c; 
    double val; 

    for(c = 0; c < n; c++) {
        val = va_arg(vl, double);
        printf("%f\n", val);
    }

    va_end(vl);
}


int main(void)
{
  foo(2, 3.3f, 4.4f);
  return 0;
}

Output:

3.300000
4.400000