Can Unsigned Long Int Hold a Ten-Digit Number?

Range of Integer Types in C

C provides various integer types with varying ranges to represent different sets of values. Determining the appropriate integer type for a specific purpose is crucial to avoid potential overflows or truncation.

Minimum Ranges

As a minimum, you can rely on the following ranges for the given integer types:

• short int and int: -32,767 to 32,767
• unsigned short int and unsigned int: 0 to 65,535
• long int: -2,147,483,647 to 2,147,483,647
• unsigned long int: 0 to 4,294,967,295

Can unsigned long int Hold a Ten-Digit Number?

For a 32-bit computer, the maximum value for unsigned long int is 4,294,967,295. This means it cannot hold a ten-digit number in the range of 1,000,000,000 to 9,999,999,999.

Larger Integer Types

To handle larger values, C99 introduced long long int to C and C 11 introduced it to C . The minimum ranges for these types are:

• long long int: -9,223,372,036,854,775,807 to 9,223,372,036,854,775,807
• unsigned long long int: 0 to 18,446,744,073,709,551,615

Therefore, long long int (and its unsigned counterpart) can hold a ten-digit number in the specified range.

Note on Lower Bounds

For int and short int, the C requirements allow for representations other than two's complement, such as one's complement or sign-magnitude. This means int is not guaranteed to represent -32,768, but instead may resort to a "trap representation" with a sign bit of 1 and all value bits set to 0.

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