Guardian C Library Calls Reference Manual

Reference to Library Calls
Guardian TNS C Library Calls Reference Manual—128833 3-7
atan
atan
The atan function computes the arc tangent of its argument.
expr
is an expression of type double.
Return Value
is the arc tangent of expr, expressed as a double value in the range -pi/2 to +pi/2
radians.
Example
This example prints “The arc tangent is 0.927295 radians.”
#include <stdioh>
#include <mathh>
int main(void)
{
double r, x, y, t;
x = 4.0;
y = 3.0;
t = x/y;
r = atan(t);
printf ("The arc tangent is %f radians.", r);
}
#include <mathh>
double atan(double expr);