Writing programs in C has nothing to do with how many bits the microcontroller has. If you define an int data, two bytes of memory will be allocated to it. So int data is 16 bits. Unsigned int data is an unsigned integer, and the highest bit does not represent the sign, so it starts from 0000,0000,0000,0000B------1111,1111,1111,1111B. That is, from 0x0000----0xffff. If converted to decimal, it is 0---65535. If it is only int type data, the highest bit represents the sign bit, 0 for positive numbers and 1 for negative numbers. At this time, this data represents from. 0x8000---0x7fff (note that the highest bit is the sign flag bit) After converting to decimal, it is. -32768---+32767. You can refer to standard C language books for the length of other data, for example, a char type data is generally 8 bits. A long int type data is usually 32 bits. And so on. These have nothing to do with the number of bits of the microcontroller itself.
Reference address：What is the length of unsigned int in 8-bit microcontroller?
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