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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;