C语言 十六进制数可以加/减十进制数吗？
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Can hexadecimal numbers be added/subtracted with decimal numbers?
提问by Vimzy
When programming in C, say if I have integer h as a hexadecimal value and integer d as a decimal number. Can I do addition or subtraction between h and d? Or do they have have to be in the same number system?
在用 C 编程时，假设我有整数 h 作为十六进制值，整数 d 作为十进制数。我可以在 h 和 d 之间做加法或减法吗？或者他们必须在同一个数字系统中？
回答by Jonathan Leffler
Yes, you can write:
是的，你可以写：
int x = 100 - 0x100 + 0100;
That mixes decimal with hex and octal. The values are all converted to binary anyway before the calculation occurs (and the compiler will do the calculation in this example; it won't be evaluated at runtime). And any of the constants can be replaced by an intvalue that was assigned the appropriate value:
这将十进制与十六进制和八进制混合。无论如何，在计算发生之前，这些值都被转换为二进制（并且编译器将在本例中进行计算；它不会在运行时进行评估）。并且任何常量都可以替换int为分配了适当值的值：
int d = 100;
int h = 0x100;
int o = 0100;
int x = d + h + o;
回答by Iharob Al Asimi
Yes they can, for example
是的，他们可以，例如
int x;
x = 0x0F + 10;
printf("%d\n", x);
Output:
输出：
25
the representation you use doesn't matter, it will be ultimately all converted to binary after all.
您使用的表示形式无关紧要，毕竟它最终会全部转换为二进制。
