What does l= mean in C language?

The "l" identifier in the C language is used as a suffix for an integer literal to represent the long type. It widens the range of integer literals and specifies type long to avoid potential type conversion errors.

The "l" identifier in C language

In C language, the "l" identifier is usually Used as a suffix, appended to an integer literal value, indicating that the literal value is of type long.

Purpose

• Expand the range of integer literals: The range of ordinary integer literals is -32768 to 32767, and the long type The literal value range is -2^31 to 2^31-1. Use the "l" suffix to expand the range of integer literal values.
• Specify long type: In some cases, you need to explicitly specify a variable or expression as long type. This can be achieved by adding the "l" suffix.

Syntax

The syntax of the suffix "l" for an integer literal is as follows:

<code>整型字面值 l</code>

For example:

int num1 = 10;  // 普通整型变量
long num2 = 10l;  // long 类型变量

Notes

• The "l" suffix can only be appended to integer literals, not other types of literals.
• On 64-bit systems, the "l" suffix usually has no practical effect because the long type and the int type have the same size.
• It is recommended to use the "l" suffix when the long type needs to be specified explicitly to avoid potential type conversion errors.

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