strange output in comparison of float with float literal

Question

``` float f = 0.7; if( f == 0.7 ) printf("equal"); else printf("not equal"); ``` Why is the output `not equal` ? Why does this happen?

Accepted Answer

This happens because in your statement

```
  if(f == 0.7)
```

the 0.7 is treated as a double. Try 0.7f to ensure the value is treated as a float:

```
  if(f == 0.7f)
```

But as Michael suggested in the comments below you should never test for exact equality of floating-point values.

Solution