#include "stdio.h" #include<stdlib.h> #include<ctype.h> #include<math.h> float fsin(float,float,float); int main() {

char a[4], b = "sin";
float angle, n;

while (scanf("%s", a)!= EOF)
{
    scanf("%f %f", &angle, &n);
    int i = 0;
    while (a[i] != '\0')//to小字母
    {
        a[i] = tolower(a[i]);
        i++;
    }
    while (angle > 180 || angle < -180)//角度轉換
    {
        if (angle > 180)angle -= 360;
        if (angle < -180)angle += 360;
    }
    angle = angle*3.14 / 180;
    if (!strcmp(a, "sin"))
    {
        printf("%f", n);
        //system("pause");
        float sum = fsin(angle, n, 0);
        printf("\n%f",sum);
    }
    else if (!strcmp(a, "cos"))
    {

    }
    else
    {
        puts("Input Error.");

    }
}
//while (getchar() != '\n');

}

float fsin(float angle, float n,float sum) { if ((int)n == -1) { printf("\n%f", sum); return sum; } int pn=-1; int div = 1; for (int i = 1; i <= 2 * n + 1; i++) div = i; if ((int)n % 2 == 0)pn = 1; sum += pnpow(angle, 2 * n + 1) / div; //printf("\n %f",sum); fsin(angle,--n,sum); }