#include<iomanip>
#include<iostream>
using namespace std;
int main(){
	double r,v;
	cin>>r;
	v=4.0/3*3.14*r*r*r;
	cout<<fixed<<setprecision(2)<<v;
	return 0;
}

#include <bits/stdc++.h>
using namespace std;
long double r,v;
signed main(){
	cin>>r;
	v=4.0/3*3.14*r*r*r;
	cout<<fixed<<setprecision(2)<<v;
	return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main(int argc, char **argv){
	double r,v,pi = 3.14;
	cin >> r;
	v = 4.0 / 3.0 * 3.14 * r * r*r;
	printf("%.2f",v);
	return 0;
}

给C23wangzishu好评

#include <set>
#include <ios>
#include <list>
#include <cmath>
#include <ctime>
#include <queue>
#include <deque>
#include <stack>
#include <vector>
#include <bitset>
#include <cctype>
#include <cerrno>
#include <cwchar>
#include <cstdio>
#include <fenv.h>
#include <iosfwd>
#include <string>
#include <limits>
#include <math.h>
#include <cstdlib>
#include <iomanip>
#include <clocale>
#include <complex>
#include <cstring>
#include <cstring>
#include <cwctype>
#include <istream>
#include <ostream>
#include <sstream>
#include <fstream>
#include <utility>
#include <stdio.h>
#include <iostream>
#include <stdint.h>
#include <string.h>
#include <tgmath.h>
#include <complex.h>
#include <algorithm>
#include <exception>
#include <stdbool.h>
#include <stdexcept>
#include <streambuf>
#include <functional>
#include <inttypes.h>
#include <bits/stdc++.h>
using namespace std;
int main(){
	double r,v;
	cin>>r;
	v=4*3.14*r*r*r;
	cout << fixed << setprecision(2)<<v/3;
	return 0;
}

#include<iostream>
#include<iomanip>
using namespace std;
int main(){
	double r,v;
	cin>>r;
	v=4.0/3*3.14*r*r*r;    
    cout<<fixed<<setprecision(2)<<v;
    return 0;
}

😄 #include using namespace std; int main(){ double r; cin>>r; printf("%.2f",4.00/3.003.14rrr); return 0; }