C语言实验——余弦
#include <stdio.h>
int main()
{
double x, sum, t, a, s, item;
int n, i;
while (scanf("%lf %d", &x, &n) != EOF)
{
t = 1.0;
item = 1.0;
sum = 1.0;
a = 1.0;
s = 1.0;
for (i = 1; i <= n; i++)
{
t = -t;
a *= x * x;
s *= (i * 2 - 1) * (i * 2);
item = t * a / s;
sum += item;
}
printf("%.4lf\n", sum);
}
return 0;
}