请问用C语言如何写这个程序啊

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#include <stdio.h>
#include <math.h>
long double jc(int n)
{
    long double jc = 1;
    for(int i=1;i<=n;i++)
        jc *= i;
    return jc;
}

int main()
{
    int flag = 1,n=1;
    double item,sinx=0;
    float x;
    scanf("%f",&x);
    item = x;
    while(item > 1e-5)
    {
        sinx += flag * item;
        item = pow(x,2*n+1)/jc(2*n+1);
        flag = flag * -1;
        n+=2;
    }
    printf("sin(%f)=%lf\n",x,sinx);
    return 0;
}


#include<iostream>
#include<cmath> //具有c++标准库中数学函数的说明 
using namespace std;
const double TINY_VALUE = 1e-6;
double tsin(double x)
{
    double g = 0; //g为sinx()最终结果 
    double t = x; //初始值x赋给t 
    int n = 1; //n 用于求分母 
    do{
        g += t;
        n++;
        t = -t * x * x / (2 * n - 1) / (2 * n - 2);
    }while(fabs(t) >= TINY_VALUE); //fabs()求double型变量的绝对值 
    return g;
}
int main()
{
    double k, r, s;
    cout << "r=";
    cin >> r;
    cout << "s=";
    cin >> s;
    if(r * r <= s * s)
    {
        k = sqrt(tsin(r) * tsin(r) + tsin(s) * tsin(s));
    }
    else 
    {
        k = tsin(r * s) / 2;
    }    
    cout << k << endl; 
    return 0;
}