Question

Hi I’m trying to convert from an int to a float in C and for some reason the cast changes the value and I’m not sure why. So:

fprintf (stderr, "%d,%d\n", rgbValues->green, (float)rgbValues->green);

produces two different numbers. Note that rgbValues->green is an int.

Any idea why this is happening?

Thanks

Answer 1

You have to say that in your format string. Use:

fprintf(stderr, "%d,%f\n", rgbValues->green, (float)rgbValues->green);
                     ^

instead of:

fprintf(stderr, "%d,%d\n", rgbValues->green, (float)rgbValues->green);
                     ^

Note the change from d to f (the circumflex ^ isn’t part of the code, just an indicator as to where to look).