Sum of geometric series using c program?

Answer 1

there are different ways of writing dis program... 1+x+(x*x)+(x*x*x*)+....has a formula for its sum... the sum for a geometric series with a as initial value and x as common ratio is (a*(pow(r,n)-1))/(r-1).... where a=1;r=x.. accept the values of x and n through keyboard remember to take x as a float value!! apply the formula and be careful about the parantheses. happy programming!!!

Answer 2

#include<stdio.h>

#include<math.h>

void main()

{

float pow = 2.0, nr, dr = 1.0, x1, sum;

int i = 1,n,s = -1,x;

clrscr();

printf("\n\n\t ENTER THE ANGLE...: ");

scanf("%d", &x);

x1 = 3.142 * (x / 180.0);

sum = 1.0;

nr = x1*x1;

printf("\n\t ENTER THE NUMBER OF TERMS...: ");

scanf("%d",&n);

while(i<=n)

{

dr = dr * pow * (pow - 1.0);

sum = sum + (nr / (dr * s));

s = s * (-1);

pow = pow + 2.0;

nr = nr * x1 * x1;

i++;

}

printf("\n\t THE SUM OF THE COS SERIES IS..: %0.3f", sum);

getch();

}

Answer 3

just get away