In this article, we will discuss some of the mathematical function which is used to derive the value of Pi(π) in C++. Method 1: Using acos() function: Approach:
- The value of Π is calculated using acos() function which returns a numeric value between [-Π, Π].
- Since using acos(0.0) will return the value for Π/2. Therefore, to get the value of Π:
double pi = 2*acos(0.0);
- Now the value obtained from above equation is estimated as:
printf("%f\n", pi);
Below is the implementation of the above approach:
CPP
// C++ program for the above approach #include "bits/stdc++.h" using namespace std; // Function that prints the // value of pi void printValueOfPi() { // Find value of pi using // acos() function double pi = 2 * acos(0.0); // Print value of pi printf("%f\n", pi); } // Driver Code int main() { // Function that prints // the value of pi printValueOfPi(); return 0; } |
Output:
3.141593
Time Complexity: O(1)
Auxiliary Space: O(1)
Method 2: Using asin() function: Approach:
- The value of Π is calculated using asin() function which returns a numeric value between [-Π, Π].
- Since using asin(1.0) will return the value for Π/2. Therefore, to get the value of Π:
double pi = 2*asin(1.0);
- Now the value obtained from above equation is estimated as:
printf("%f\n", pi);
Below is the implementation of the above approach:
CPP
// C++ program for the above approach #include "bits/stdc++.h" using namespace std; // Function that prints the // value of pi void printValueOfPi() { // Find value of pi using // asin() function double pi = 2 * asin(1.0); // Print value of pi printf("%f\n", pi); } // Driver Code int main() { // Function that prints // the value of pi printValueOfPi(); return 0; } |
Output:
3.141593
Time Complexity: O(1)
Auxiliary Space: O(1)
Method 3: Using inbuilt constant value define in the “cmath” library: The value of Pi(π) can directly written using the constant stored in cmath library. The name of the constant is M_PI. Below is the program for printing the value of Pi:
CPP
// C++ program for the above approach #include "cmath" #include "iostream" using namespace std; // Function that prints the // value of pi void printValueOfPi() { // Print value of pi printf("%f\n", M_PI); } // Driver Code int main() { // Function that prints // the value of pi printValueOfPi(); return 0; } |
Output:
3.141593
Time Complexity: O(1)
Auxiliary Space: O(1)
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