By | 05.11.2016

# Cosine Series using function cos(x)

Write a C Program to find Cosine Series using function cos(x). Here’s simple C Program to find Cosine Series using function cos(x) in C Programming Language.

## Numbers in C

Normally, when we work with Numbers, we use primitive data types such as int, short, long, float and double, etc. The number data types, their possible values and number ranges have been explained while discussing C Data Types.

Here is source code of the C Program to find Cosine Series using function cos(x). The C program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.

### SOURCE CODE : :

```/*  C Program to find Cosine Series using function cos(x)  */

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

int factorial(int n)
{
int i,fact=1;
for(i=1;i<=n;i++)
fact=fact*i;
return fact;
}

int main()
{
double x, cosx=1, z, term;
int j, n, i,sign=1;

printf("\nEnter the value for x : ") ;  //Example 45 180 90 360
scanf("%lf", &x) ;
printf("\nEnter the value for n : ") ;   //Example 10 20
scanf("%d", &n) ;

x = x * 3.14159 / 180 ;   //converting degree to radian
i=0;
z=cos(x);

for(i=2;i<=n;i=i+2)
{
sign=-sign;
term=sign*pow(x,i)/factorial(i);
cosx=cosx+term;
}

printf("\ncos(x) is approximately %.15lf\n", cosx);
printf("\ncos(x) by default function is %.15lf\n", z);

return 0;
}```

### OUTPUT : :

```/*  C Program to find Cosine Series using function cos(x)  */

Enter the value for x : 120

Enter the value for n : 20

cos(x) is approximately -0.500539546249695

cos(x) by default function is -0.499998467948436

Process returned 0```

Above is the source code for C Program to find Cosine Seriesusing function cos(x) which is successfully compiled and run on Windows System.The Output of the program is shown above .

If you found any error or any queries related to the above program or any questions or reviews , you wanna to ask from us ,you may Contact Us through our contact Page or you can also comment below in the comment section.We will try our best to reach up to you in short interval.

5 1 vote
Article Rating
Category: C Programming Number Programs Tags:  