{"id":1462,"date":"2015-02-03T04:55:29","date_gmt":"2015-02-02T18:55:29","guid":{"rendered":"http:\/\/brnz.org\/hbr\/?p=1462"},"modified":"2015-02-03T09:42:51","modified_gmt":"2015-02-02T23:42:51","slug":"whats-the-difference-between-0xffffffff-and-0xffffffffu","status":"publish","type":"post","link":"https:\/\/brnz.org\/hbr\/?p=1462","title":{"rendered":"What’s the difference between 0xffffffff and 0xffffffffu?"},"content":{"rendered":"

In C++, what is the difference between 0xffffffff<\/strong> and 0xffffffffu<\/strong>?<\/p>\n

This one’s pretty easy to answer with this information from the C++ standard:<\/p>\n

The type of an integer literal is the first of the corresponding list in Table 6 in which its value can be represented.\"\"<\/p><\/blockquote>\n

0xffffffff<\/strong> is a hexadecimal constant, it’s too big to be represented in a (signed<\/strong>) int<\/strong>, so — by the terms of the standard — the type of 0xffffffff<\/strong> is unsigned int<\/strong>.<\/p>\n

Furthermore, each of these hexadecimal literals will have a different type:<\/p>\n

0x7fffffff   \/\/ int\r\n0xffffffff   \/\/ unsigned int\r\n0x1ffffffff  \/\/ long int (or long long int)\r\n0x1ffffffffu \/\/ unsigned long int (or unsigned long long int)\r\n<\/pre>\n
But to answer the original question, there is no difference between 0xffffffff<\/strong> and 0xffffffffu<\/strong>\u00a0apart from this:<\/p>\n
@twoscomplement<\/a> One is a commonly used curse when the compiler screws up.<\/p>\n
\u2014 Colin Riley (@domipheus) January 30, 2015<\/a><\/p><\/blockquote>\n