wanderer wanderer - 2 months ago 20
C Question

Function pointer for inverse of exp function in c

I am trying to define a function pointer which calculates e^-x.
Something similar to C# equivalent:

Func<double, double> f = x => Math.Exp(-x);


I tried in vain by doing something like:

double(*negativeExp(double x))(double) {
double eValue = exp(1);
return pow(eValue, -x);
}


Any ideas.

M.M M.M
Answer

The code for the function would be:

double f(double x)
{
    return exp(-x);
}

Then you can make a pointer to that function. Sample use:

int main(void)
{
    double (*p)(double) = &f;

    printf("f(1) == %f", p(1));
}
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