解题思路:
注意事项:
参考代码:
#include<stdio.h>
double fact(int n)
{
int i = 0;
double sum = 1;
for (i = 1; i <= n; i++)
sum = sum*i;
return sum;
}
double mypow(double x, int n)
{
int i = 0;
double sum = 1;
for (i = 1; i <= n; i++)
sum = sum*x;
return sum;
}
int main()
{
int n, flag = 1, i = 0;
double sum = 0, s1, s2, x;
scanf("%lf %d", &x, &n);
for (i = 1; i <= n; i++)
{
s1 = flag*mypow(x, i);
s2 = fact(i);
sum += s1 / s2;
flag *= -1;
}
printf("%.4f", sum);
return 0;
}
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