#include <iostream>
using namespace std;
int main()
{
    int a,b;
    cin>>a>>b;
    double c = (double)a/b;
    printf("%.9f",c);
    return 0;
}

#include<iostream>
#include<algorithm>
#include<stack>
#include<queue>
#include<cmath>
#include<cstdio>
#include<cstring>
#include<string>
using namespace std;
int main(){	
	int r1,r2;
	cin >> r1 >> r2;
	printf("%.9lf",r1*1.0/r2);
	return 0;
} 

#include <bits/stdc++.h>
using namespace std;
int main(){
	int a,b;
	cin>>a>>b;
	printf("%.9f",1.0*a/b);
	return 0;
}

其实很简单，只需要让分子除以分母就可以了

#include<bits/stdc++.h>
using namespace std;
long long q,w,e,r,t,y,u,i,o,p,d,f,g,h,j,k,l,z,x,c,v,b,n,m;
string s;double dd,ee;
long long a[100000],as[100000],asd[100000];
int main()
{
	cin>>dd>>ee;
	cout<<fixed<<setprecision(9)<<dd*1.000000000000000/ee;
    return 0;
}