What Does the 'ULL' Suffix Mean in a Numeric Literal?

ULL Suffix on a Numeric Literal: Unraveling the Mystery

Numeric literals play a fundamental role in programming. However, some less common suffixes can often leave developers puzzled. One such example is the 'ULL' suffix on numeric literals.

Background:

In the code snippet, a numeric literal is assigned the value obtained by applying a bitwise AND operation between a variable 'addr' and the value 0x3fULL. The inclusion of 'ULL' at the end of the hex numeric literal raises questions about its significance.

Answer:

The 'ULL' suffix is a type suffix indicator that specifies the data type of the numeric literal. It stands for "Unsigned Long Long," indicating that the literal should be interpreted as an unsigned 64-bit integer.

This suffix is particularly useful for situations where the value may exceed the range of standard integer (int) or long (long int) types. Using the 'ULL' suffix ensures that the literal is stored in an appropriate data type that can accommodate the given value.

Compiler Support:

The 'ULL' suffix was introduced in the C99 standard and has been supported by most modern compilers. However, it was also supported as a compiler extension in C long before its inclusion in the C 11 standard.

Usage:

To specify an unsigned long long integer literal, simply append the 'ULL' suffix to the end of the numeric value. For example:

unsigned long long myValue = 1234567890123456789ULL;

By using the appropriate type suffix, you ensure that your code operates correctly and handles integer values within the intended range.

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