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Synopsis:
    #include <math.h>
    double atan( double x );

Description:
    The atan function computes the principal value of the arctangent of x.

Returns:
    The atan function returns the arctangent in the range (-P/2,P/2).

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

    void main()
      {
        printf( "%f\n", atan(.5) );
      }

    produces the following:

    0.463648

Classification:
    ANSI

Systems:
    Math

See Also:
    acos, asin, atan2