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I am reading some tutorials on embedded programming and one of them says int and signed int are different but does not explain how or why.
I understand why unsigned int and int are different but int and signed int being different is a new one for me.
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The XDR standard defines signed integers as integer. A signed integer is a 32-bit datum that encodes an integer in the range [-2147483648 to 2147483647]. An unsigned integer is a 32-bit datum that encodes a nonnegative integer in the range [0 to 4294967295].
Variables such as integers can be represent in two ways, i.e., signed and unsigned. Signed numbers use sign flag or can be distinguish between negative values and positive values. Whereas unsigned numbers stored only positive numbers but not negative numbers.
There is no difference. unsigned and unsigned int are both synonyms for the same type (the unsigned version of the int type).
The int type in C is a signed integer, which means it can represent both negative and positive numbers. This is in contrast to an unsigned integer (which can be used by declaring a variable unsigned int), which can only represent positive numbers.
It is for historical reasons only. Today whenever you declare int you get a signed int. The only point where you might see a difference even with today's compilers is with char versus signed char which are different by specification (and notable when assigning a literal string) but not with int.
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As far as I know the difference exists only for char data type. Where char a; can be signed char a; or unsigned char a; depending on compiler options. As this article says. (--signed_chars)
For int data types, there is no difference between int and signed int.
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