C Code for 2d Vector Angle

This c programming code is used to find the 2d vector angle. You can select the whole c code by clicking the select option and can use it. When you click text, the code will be changed to text format. This c program code will be opened in a new pop up window once you click pop-up from the right corner. You can just copy, paste this c code and use it to find the 2d vector angle.

#include<stdio.h>
#include<math.h>
#define PI 3.14159265358979323846 
int main()
{
     float i,c=1,e=11,d=2,f=2;
     i=(acos(((c*e)+(d*f))/(sqrt((c*c)+(d*d))*sqrt((e*e)+(f*f))))*360)/(PI*2);
     printf("Angle = %f degrees",i);
     return 0;
}