The expression appearing on right side of the assignment operator is called as rvalue. Rvalue is assigned to lvalue, which appears on left side of the assignment operator. The lvalue should designate to a variable not a constant.
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These can be used exactly the same way as the punctuation symbols they replace, as they are not the same operator under a different name, but rather simple token replacements for the name (character string) of the respective operator. This means that the expressions (a > 0 and not flag) and (a > 0 && !flag) have identical meanings. It also means that, for example, the bitand keyword may be used to replace not only the bitwise-and operator but also the address-of operator, and it can even be used to specify reference types (., int bitand ref = n ). The ISO C specification makes allowance for these keywords as preprocessor macros in the header file . For compatibility with C, C++ provides the header ciso646 , the inclusion of which has no effect.
You may do calculations with both full numbers – integers – and fractional numbers – floating points. But be careful: the end results may not be what you expect!
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