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Value of pie using c++:


THEORY:
Pi is the ratio of a circle's circumference to its diameter.
Pi is also an irrational number, which means that its value cannot be expressed exactly as a simple fraction. Computers have calculated pi to over three trillion digits.
  • Pi to 10 digits: 3.1415926535
The Greek letter π was first used to represent pi by William Jones in 1706, because π was an abbreviation of the Greek word for perimeter: "περίμετρος."
CODING:
#include<iostream.h>
#include<conio.h>
void main()
{     
int i;
double p=0;
clrscr();
for(i=1;i<=100;i++)
{
if(i%2==0)
{
p=p-(4.0/(2*i-1));
}
else
{
p=p+(4.0/(2*i-1));
}
}
cout<<"value of pi="<<p<<\"t";
getch();
}
OUTPUT:

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