What does d mean in C language?

In C language, "d" represents the double-precision floating-point data type, which is used to represent floating-point values ​​with higher precision than the "float" type. Its characteristics include: it occupies 8 bytes of memory space, has a precision range of 15-16 significant figures, can represent maximum or minimum values, and is often used in situations where high-precision floating point calculations are required. Syntax: Variables and constants are declared as double d = 3.14;.

The meaning of "d" in C language

In C language, "d" usually means double precision Floating point data type. It is used to represent floating point values ​​with higher precision than the "float" data type.

Features:

• Occupies 8 bytes (64 bits) of memory space
• Accuracy range: 15-16 significant digits
• Can represent very large values ​​and very small values
• Used in situations where high-precision floating point calculations are required, such as scientific calculations and mathematical operations

Syntax:

Declaration of variables and constants:

<code class="c">double d = 3.14;</code>

Example:

<code class="c">#include <stdio.h>

int main() {
    double d = 2.5;
    printf("双精度浮点型变量 d 的值：%lf\n", d);
    return 0;
}</code>

Output:

<code>双精度浮点型变量 d 的值：2.500000</code>

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