**Pi**(π). This ratio, which is around

**3.141593**, is irrational. It is often used in geometry, trigonometry, and mathematical analysis in a variety of calculations and formulas.

**Pi**is an important constant that has been known since ancient times, but its exact value was discovered in the 18th century. This value is used in a variety of mathematical applications and is widely recognized as the number used to calculate the circumference of a circle.

If you are implementing a C code and need the **Pi **value at some point, you will need guidance on how to use **Pi **constant value in programming. If you’re looking for assistance on the concept of Pi, read this article.

**Pi Constant Value in C Language**

The C programming language is a versatile language used in many software applications. It is commonly used for writing code for embedded systems, desktop applications, web applications, and various other software programs. The C language also allows for the use of constants, which are fixed values that can be used in code. In particular, the constant value of **Pi in the C language** is a very important constant that can be used in many mathematical calculations.

When using **Pi in C programming**, it is not necessary to write out the full decimal value of the constant. Instead, it is more common to use a shorter version known as the hexadecimal form. This form is represented as **0x3F,** which in hexadecimal is the same value as **3.14159**. This allows for easier typing, instead of having to type out all the decimal digits. It should also be noted that this hexadecimal form is not exact, so it is best used when the accuracy of calculations is not critical.

The **M_PI** constant, which is specified in the <**math.h**> header file can be used to represent **Pi** in C programs. An example of the **Pi constant** is given below.

In this code, we use the formula **A = πr^2** to get the area of a circle of **radius 7.4**, where r is denoted by **M_PI.**

**Output**

**Final Thoughts**

**Pi **is an important mathematical constant widely used in a variety of calculations and formulas. It is represented in the C programming language as **0x3F**, and its value is **3.141593**. The above-mentioned guidelines present a code as well to help users how to use the **Pi** value in a mathematical calculation or separately find its value in the C program. The users can use the **“M_PI” **with **double data type **in a program to use the **Pi **value in the calculation.