We are supposed to calculate e^x using this kind of formula:

e^x = 1 + (x ^ 1 / 1!) + (x ^ 2 / 2!) ......

I have this code so far:

while (result >= 1.0E-20 )
{
    power = power * input;
    factorial = factorial * counter;
    result = power / factorial;
    eValue += result;
    counter++;
    iterations++;
}

My problem now is that since factorial is of type long long, I can't really store a number greater than 20! so what happens is that the program outputs funny numbers when it reaches that point ..

The correct solution can have an X value of at most 709 so e^709 should output: 8.21840746155e+307

The program is written in C++.

c++ math exponential
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