C <math.h> - atan() Function
The C <math.h> atan() function returns arc tangent of a value. The returned value will be in the range -𝜋/2 through 𝜋/2.
Note: atan() is the inverse of tan().
Syntax
double atan (double x); float atanf (float x); long double atanl (long double x);
Parameters
x |
Specify the value. |
Return Value
Returns the arc tangent of the value.
Example:
In the example below, atan() function is used to find out the arc tangent of a given value.
#include <stdio.h>
#include <math.h>
int main (){
printf("%lf\n",atan(0.5));
printf("%lf\n",atan(1));
printf("%lf\n",atan(2));
return 0;
}
The output of the above code will be:
0.463648 0.785398 1.107149
❮ C <math.h> Library
