56 lines
1.1 KiB
C
56 lines
1.1 KiB
C
// Originally written in 2015
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#include<stdio.h>
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#include<math.h>
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double pow1(int base, int power)
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{
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double p=1;
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int j=0;
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for(; j<power ; ++j)
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{
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p*=base;
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}
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return p;
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}
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double factorial(int a)
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{
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int j=a;
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double f=1;
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for(; j>1; --j)
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{
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f*=j;
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}
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return f;
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}
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int main()
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{
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int k, i;
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double pi=0;
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printf("Enter the value of k: ");
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scanf("%d", &k);
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for(i=0; i<k; ++i)
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{
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pi+=((factorial(4*i) * (1103 + (26390*i))) / (pow1(factorial(i), 4) * pow1(396, 4*i)) );
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}
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pi*=(double) ( ( 2 * sqrt(2) ) / ( 9801 ) );
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pi = (double) ( 1 / pi );
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printf("The value of pi using Ramanujan's equation is: %.20lf\n", pi);
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return 0;
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}
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/*
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Enter the value of k: 1
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The value of pi using Ramanujan's equation is: 3.14159273001330552333
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Enter the value of k: 2
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The value of pi using Ramanujan's equation is: 3.14159265358979356009
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Enter the value of k: 10
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The value of pi using Ramanujan's equation is: 3.14159265358979311600
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Enter the value of k: 100
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The value of pi using Ramanujan's equation is: -nan
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*/
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