Why doesn't C have unsigned floats?

Question

I know, the question seems to be strange. Programmers sometimes think too much. Please read on...

In C I use signed and unsigned integers a

Answer 1

A square-root will definately never return a negative number. There are other places as well where a negative float value has no meaning. Perfect candidate for an unsigned float.

C99 supports complex numbers, and a type generic form of sqrt, so sqrt( 1.0 * I) will be negative.

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The commentors highlighted a slight gloss above, in that I was referring to the type-generic sqrt macro rather than the function, and it will return a scalar floating point value by truncation of the complex to its real component:

#include 
#include 

int main () 
{
    complex double a = 1.0 + 1.0 * I;

    double f = sqrt(a);

    return 0;
}

It also contains a brain-fart, as the real part of the sqrt of any complex number is positive or zero, and sqrt(1.0*I) is sqrt(0.5) + sqrt(0.5)*I not -1.0.