根据公式计算e

//根据公式计算e
//
//e = sum(i!); i= 0->n;
//
#include <stdio.h>
int Factorial(int n)
{
if (n <= 1)
{
return 1;
}
return n*Factorial(n-1);
}

double Calculate_e(int n)
{
double sum = 0;
for (int i = 0; i <= n; i++)
{
sum += 1/(double)Factorial(i);
}
return sum;
}

int main()
{
printf("n e\n------------------------\n");
for (int i = 0; i<10; i++)
{
if (i<=1)
{
printf("%d %.0f\n", i, Calculate_e(i));
}
else if (i == 2)
{
printf("%d %.1f\n", i, Calculate_e(i));
}
else
{
printf("%d %f\n", i, Calculate_e(i));
}
}
return 0;
}

转载于:https://www.cnblogs.com/hanxi/archive/2011/04/04/2005376.html