What does pi mean in C language?

π in C language represents the ratio of the circumference and diameter of a circle. It is an irrational number approximately 3.14159. It is defined as the constant M_PI in the <math.h> header file, which can be used to perform circle-related calculations. calculate.

π in C language

What is π?

π (pronounced "pie") is an irrational number in mathematics that represents the ratio of the circumference and diameter of a circle. Its approximate value is 3.14159.

π in C language

In C language, π is defined as a constant named M_PI. It is located in the <math.h> header file.

Usage

In C language, you can use the M_PI constant to perform circle-related calculations, for example:

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

double radius = 5.0;
double circumference = 2 * M_PI * radius;

printf("圆的周长：%f\n", circumference);</code>

Output:

<code>圆的周长：31.415927</code>

Note

• M_PI is an approximation, for very precise calculations you may need to use another method to calculate π.
• Depending on the compiler, the value of M_PI may vary slightly, but is generally very close to 3.14159.

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