cos(x) 系列を求める C プログラム

Input-: x = 10, n = 3
Output-: 0.984804
Input-: x = 8, n = 2
Output-: 0.990266

Start
Step 1 Declare and initialize const double PI = 3.142
Step 2 In function double series_sum(double x, int n)
   Set x = x * (PI / 180.0)
Set result = 1
Set s = 1, fact = 1, pow = 1
    Loop For i = 1 and i < 5 and i++
        Set s = s * -1
        Set fact = fact * (2 * i - 1) * (2 * i)
        Set pow = pow * x * x
        Set result = result + s * pow / fact
     End Loop
    Return result
Step 3 In function int main() s
    Declare and set x = 10
Declare and set n = 3
    Print series_sum(x, n)  
Stop

#include <stdio.h>
const double PI = 3.142;
//will return the sum of cos(x)
double series_sum(double x, int n) {
    x = x * (PI / 180.0);
    double result = 1;
    double s = 1, fact = 1, pow = 1;
    for (int i = 1; i < 5; i++) {
        s = s * -1;
        fact = fact * (2 * i - 1) * (2 * i);
        pow = pow * x * x;
        result = result + s * pow / fact;
    }
    return result;
}
//main function
int main() {
    float x = 10;
    int n = 3;
    printf("%lf</p><p>", series_sum(x, n));  
    return 0;
}

X=10; n=30.984804
X=13; n=80.974363
X=8; n=2 0.990266