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Atan2 / Atan2l Function >> Math.h >> Header Files in C

Atan2 :

  1. Interpret it as - A tan 2
  2. ‘2’ Means It Takes Two Parameters
  3. The atan2() function computes the arc tangent of Y/X
  4. Signs of the arguments is used to compute the quadrant of the return value .
  5. Header File : Math.h

Syntax : 

double atan2(double y,double x);


    

  • Return Value : Double [ Arc Tangent of Ratio Y/X ]
    • 

  • No Of Parameters : 2
    • 

  • Double X : Floating point value representing an X-Co-Ordinate
    • 

  • Double Y : Floating point value representing an Y-Co-Ordinate
    • 



Live Example :


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

 int main(void)
 {
    double res;
    double x = 90.0, y = 45.0;

    res = atan2(y, x);
    printf("The arc tangent ratio of %lf is %lfn",(y/x),res);
    return 0;
 }


Output :


The arc tangent ratio of 0.500000 is 0.463648


How to Convert Number into Degree : 
Using Following Statement -


result = atan2(y,x)*180/M_PI;