int main()
{
float a = 0.7, b = 0.5; // These are FLOATS
if(a < .7) // This is a DOUBLE
{
if(b < .5) // This is a DOUBLE
printf("2 are right");
else
printf("1 is right");
}
else
printf("0 are right");
}
Floats get promoted to doubles during comparison, and since floats are less precise than doubles, 0.7 as float is not the same as 0.7 as double. In this case, 0.7 as float becomes inferior to 0.7 as double when it gets promoted. And as Christian said, 0.5 being a power of 2 is always represented exactly, so the test works as expected: 0.5 < 0.5
is false.
So either:
- Change
float
todouble
, or: - Change
.7
and.5
to.7f
and.5f
,
and you will get the expected behavior.