[Programming] C language cyclic structure computing π value,

[Programming] C language cyclic structure computing π value,

Formula:

 

Analysis: first, the denominator of an item with a positive coefficient is 4n-3 (n is the number of items with a positive number), and the denominator of a negative item is 4n-1 (n is the number of items with a negative number ), that is, the rule of denominator change is 1, 3, 5, 7... the denominator of n is 2n-1, and the denominator of 10,000th is 2*10000-1.

 

Code:

# Include <stdio. h> int main () {// calculate the π value int I; int z; double f; double p = 0; for (I = 1; I <= 100000000; I ++) {// modulo z = I % 2; // each f = (double) 1/(2 * i-1 ); // when z is equal to 0, It is a negative value. if (z = 0) {f =-1 * f;} // Add p + = f ;} // The final π value p = p * 4; printf ("% lf", p );}