double to float conversion error

[praneshiitm]

float w = 0.80;

this gives an error: warning C4305: 'initializing' : truncation from 'double' to 'float'.
please tell me about this.

[Vlad Licker]

That's not an error, that's a warning. Warnings don't stop compilation. In order for the literal value to be of type float you need to append a "f" at the end of it.

float w = 0.80f;