Why data cast is not working here in c++?

The problem isn’t that you aren’t casting correctly, it is that you aren’t doing it at the right time. Because of precedence, the 2 / 5 will be done first, with integer division, leaving 2. This will be then be cast to a double, which stays as 2. If you want to have it as 2.5, you will have to cast them before you do the division. This could look like:

std::cout << (float)5 / (float)2 << std::endl;

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