e^1+e^2+e^3+.+e^n

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e^1+e^2+e^3+.+e^n

e^1+e^2+e^3+.+e^n
e^1+e^2+e^3+.+e^n

e^1+e^2+e^3+.+e^n
for (int i = 1; i <= 50; i++)
{
double mNum = i;
for (int j = i - 1; j > 0; j--)
{
mNum *= j;
}
num += 1 / mNum;
}
Console.WriteLine(num);
第二个:
double num = 0;
int i = 1;
double mNum = 0;
do
{
mNum = i;
for (int j = i - 1; j > 0; j--)
{
mNum *= j;
}
num += 1 / mNum;
i++;
} while (1 / mNum > Math.Pow(10,-4));
Console.WriteLine(num);