The overflow of unsigned int is fully defined by the c standard community but not defined for the signed int. Below I am discussing few points in favor of unsigned int. Below is list of ranges along with the memory requirement and format specifiers on 32 bit gcc compiler. Let us see if the variable is declared signed int and we want it to convert it into unsigned int which is a bit confusing in C programming. The most significant byte is 0 and the least significant is 3. 0 to 65535 would be a 16-bit unsigned. An unsigned integer is a 32-bit datum that encodes a nonnegative integer in the range [0 to 4294967295]. The lower bound, as for any unsigned type, is 0. The upper bound is given by the macro [code ]ULONG_MAX[/code], defined in the header. A 32-bit unsigned int has a range from 0 to 4,294,967,295. It has several variants which includes int, long, short and long long along with signed and unsigned variants The size of int is 4 bytes and range is -2147483648 to 214748364 long long is of 16 bytes The range of unsigned int is larger than the range of the signed int. printf("Unsigned int values range: %u\n", (unsigned int) UINT_MAX); return 0;} Output: Explanation: So in general, in C we have signed and unsigned integer data types to declare in the program. An unsigned long long (and, on a 64-bit implementation, possibly also ulong and possibly uint as well) have a range (at least) from 0 to 18,446,744,073,709,551,615 (2 64 -1). These ranges may vary from compiler to compiler. The signed integer is represented in twos complement notation. Basic types Main types. Please keep in mind that storage size and range for int and float datatype will vary depend on the CPU processor (8,16, 32 and 64 bit) C Data types / storage Size: Range: char / 1 –127 to 127: int / 2 ... unsigned long int / 4: 0 to 4,294,967,295: unsigned long long int / 8: 2(power)64 –1: 2. > What is the range of unsigned long int in C? Range of char = -128 to 127 Range of unsigned char = 0 to 255 Range of short = -32768 to 32767 Range of unsigned short = 0 to 65535 Range of int = -2147483648 to 2147483647 Range of unsigned int = 0 to 4294967295 Range of long = -2147483648 to 2147483647 Range of unsigned long = 0 to 4294967295 Range of long long = -9223372036854775808 to 9223372036854775807 Range of unsigned … The C language provides the four basic arithmetic type specifiers char, int, float and double, and the modifiers signed, unsigned, short, and long.The following table lists the permissible combinations in specifying a large set of storage size-specific declarations. 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