C program to find the value of cos(x)

Write a C program to find the value of cos(x) using the series up to the given accuracy (without using user defined function) Also print cos(x) using library function. Read more about C Programming Language.

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#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <stdlib.h>

void main()
{
 int  n, x1;
 float  acc, term, den, x, cosx=0, cosval;

 clrscr();

 printf("Enter the value of x (in degrees)n");
 scanf("%f",&x);

 x1 = x;

 /* Converting degrees to radians*/

 x = x*(3.142/180.0);
 cosval = cos(x);

 printf("Enter the accuary for the resultn");
 scanf("%f", &acc);
 term = 1;
 cosx = term;
 n = 1;

 do
 {
  den = 2*n*(2*n-1);
  term = -term * x * x / den;
  cosx = cosx + term;
  n = n + 1;
 } while(acc <= fabs(cosval - cosx));

 printf("Sum of the cosine series       = %fn", cosx);
 printf("Using Library function cos(%d) = %fn", x1,cos(x));
}         /*End of main() */
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