T214915 [BXOI R1] 三角函数 题解

按照题意模拟即可，注意printf保留小数

std:

#include<bits/stdc++.h>
#define ll long long
using namespace std;

int main(){

    double a,b,c;
    scanf("%lf%lf",&a,&b);
    c = sqrt(a*a+b*b);
    printf("%.2lf\n",c);
    double sina = a/c,cosa = b/c,tana = a/b,tanb = b/a;
    printf("%.2lf %.2lf %.2lf %.2lf %.2lf %.2lf",sina,cosa,cosa,sina,tana,tanb);

    return 0;
}