C Programming Code Examples
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C Program to Calculate the Value of cos(x)
/* C Program to Calculate the Value of cos(x)
- 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. */
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
void main()
{
int j, x1;
float accuracy, term, denominator, x, cosx, cosval;
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 accuracy for the result \n");
scanf("%f", &accuracy);
term = 1;
cosx = term;
j = 1;
do
{
denominator = 2 * j * (2 * j - 1);
term = -term * x * x / denominator;
cosx = cosx + term;
j = j + 1;
} while (accuracy <= fabs(cosval - cosx));
printf("Sum of the cosine series = %f\n", cosx);
printf("Using Library function cos(%d) = %f\n", x1, cos(x));
}
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