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Annotation of 43BSDReno/lib/libF77/CCI/tanh.c, revision 1.1

1.1     ! root        1: /*
        !             2:  *     @(#)tanh.c      5.1 (Berkeley) 11/3/86
        !             3:  */
        !             4: 
        !             5: /*
        !             6:        tanh(arg) computes the hyperbolic tangent of its floating
        !             7:        point argument.
        !             8: 
        !             9:        sinh and cosh are called except for large arguments, which
        !            10:        would cause overflow improperly.
        !            11: */
        !            12: 
        !            13: double sinh(), cosh();
        !            14: 
        !            15: double
        !            16: tanh(arg)
        !            17: double arg;
        !            18: {
        !            19:        double sign;
        !            20: 
        !            21:        sign = 1.;
        !            22:        if(arg < 0.){
        !            23:                arg = -arg;
        !            24:                sign = -1.;
        !            25:        }
        !            26: 
        !            27:        if(arg > 21.)
        !            28:                return(sign);
        !            29: 
        !            30:        return(sign*sinh(arg)/cosh(arg));
        !            31: }

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