Language: C++

//Author: AnandRaj doubleux
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<pii> vpii;
typedef pair<ll,ll> pll;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<pll> vpll; 

#define fastio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define test() int t;cin>>t;while(t--)
#define all(v) v.begin(),v.end()
#define prin(V) for(auto v:V) cout<<v<<" ";cout<<endl
#define take(V,f,n) for(int in=f;in<f+n;in++) cin>>V[in]
#define what(x) cerr<<#x<<" = "<<x<<endl
#define KStest() int t,t1;cin>>t;t1=t;while(t--)
#define KScout cout<<"Case #"<<t1-t<<": "

const int MOD = 1e9+7,MAX = 1e6+5;
/////////////////FastExp///////////////////
ll powN(ll a,ll p,ll mod)
{
	if(p==0) return 1;
	ll z=powN(a,p/2,mod);
	z=(z*z)%mod;
	if(p%2) z=(z*a)%mod;
	return z;
}
/////////////////FastExp///////////////////
//////////////////Sieve////////////////////
vector<bool> is_prime(MAX, true);
vector<int> MinDiv(MAX);
void Sieve()
{
	is_prime[0] = is_prime[1] = false;
	int i,j;
	for (i = 2; i*i <= MAX; i++) 
	{
    	if (is_prime[i]) 
    	{
    		MinDiv[i]=i;
        	for (j = i * i; j <= MAX; j += i)
            {
				is_prime[j] = false;
				MinDiv[j]=i;
    		}
    	}
	}
	for(int i=2;i<=MAX;i++) if(is_prime[i]) MinDiv[i]=i;
}
//////////////////Sieve////////////////////

const double pi = 4*atan(1);

int main()
{
	int a,b,h,m;
	cin>>a>>b>>h>>m;
	double degh = h*30+m*0.5;
	double degm = m*6;

	double dis = a*a+b*b-2*a*b*cos(abs(degm-degh)*pi/180);

	cout<setprecision(10)<<sqrt(dis)<<endl;
}		

Compiler output:
a.cc: In function 'int main()':
a.cc:70:30: error: no match for 'operator<<' (operand types are 'std::_Setprecision' and 'double')
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |              ~~~~~~~~~~~~~~~~^~~~~~~~~~~
      |                          |         |
      |                          |         double
      |                          std::_Setprecision
In file included from /usr/include/c++/14/regex:68,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:181,
                 from a.cc:2:
/usr/include/c++/14/bits/regex.h:1715:5: note: candidate: 'template<class _Ch_type, class _Ch_traits, class _Bi_iter> std::basic_ostream<_CharT, _Traits>& std::__cxx11::operator<<(std::basic_ostream<_CharT, _Traits>&, const sub_match<_Bi_iter>&)'
 1715 |     operator<<(basic_ostream<_Ch_type, _Ch_traits>& __os,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1715:5: note:   template argument deduction/substitution failed:
a.cc:70:40: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |                                        ^
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:41:
/usr/include/c++/14/cstddef:125:5: note: candidate: 'template<class _IntegerType> constexpr std::__byte_op_t<_IntegerType> std::operator<<(byte, _IntegerType)'
  125 |     operator<<(byte __b, _IntegerType __shift) noexcept
      |     ^~~~~~~~
/usr/include/c++/14/cstddef:125:5: note:   template argument deduction/substitution failed:
a.cc:70:26: note:   cannot convert 'std::setprecision(10)' (type 'std::_Setprecision') to type 'std::byte'
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |              ~~~~~~~~~~~~^~~~
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/string_view:763:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, basic_string_view<_CharT, _Traits>)'
  763 |     operator<<(basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:763:5: note:   template argument deduction/substitution failed:
a.cc:70:40: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |                                        ^
/usr/include/c++/14/bits/basic_string.h:4077:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 4077 |     operator<<(basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:4077:5: note:   template argument deduction/substitution failed:
a.cc:70:40: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |                                        ^
/usr/include/c++/14/bitset:1687:5: note: candidate: 'template<class _CharT, class _Traits, long unsigned int _Nb> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const bitset<_Nb>&)'
 1687 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/usr/include/c++/14/bitset:1687:5: note:   template argument deduction/substitution failed:
a.cc:70:40: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |                                        ^
In file included from /usr/include/c++/14/bits/ios_base.h:46,
                 from /usr/include/c++/14/streambuf:43,
                 from /usr/include/c++/14/bits/streambuf_iterator.h:35,
                 from /usr/include/c++/14/iterator:66,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:54:
/usr/include/c++/14/system_error:339:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const error_code&)'
  339 |     operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
      |     ^~~~~~~~
/usr/include/c++/14/system_error:339:5: note:   template argument deduction/substitution failed:
a.cc:70:40: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |                                        ^
In file included from /usr/include/c++/14/memory:80,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:56:
/usr/include/c++/14/bits/shared_ptr.h:70:5: note: candidate: 'template<class _Ch, class _Tr, class _Tp, __gnu_cxx::_Lock_policy _Lp> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const __shared_ptr<_Tp, _Lp>&)'
   70 |     operator<<(std::basic_ostream<_Ch, _Tr>& __os,
      |     ^~~~~~~~
/usr/include/c++/14/bits/shared_ptr.h:70:5: note:   template argument deduction/substitution failed:
a.cc:70:40: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |                                        ^
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:563:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _CharT)'
  563 |     operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:563:5: note:   template argument deduction/substitution failed:
a.cc:70:40: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |                                        ^
/usr/include/c++/14/ostream:573:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, char)'
  573 |     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:573:5: note:   template argument deduction/substitution failed:
a.cc:70:40: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |                                        ^
/usr/include/c++/14/ostream:579:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, char)'
  579 |     operator<<(basic_ostream<char, _Traits>& __out, char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:579:5: note:   template argument deduction/substitution failed:
a.cc:70:40: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<char, _Traits>'
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |                                        ^
/usr/include/c++/14/ostream:590:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, signed char)'
  590 |     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:590:5: note:   template argument deduction/substitution failed:
a.cc:70:40: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<char, _Traits>'
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |                                        ^
/usr/include/c++/14/ostream:595:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, unsigned char)'
  595 |     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:595:5: note:   template argument deduction/substitution failed:
a.cc:70:40: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<char, _Traits>'
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |                                        ^
/usr/include/c++/14/ostream:654:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const _CharT*)'
  654 |     operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:654:5: note:   template argument deduction/substitution failed:
a.cc:70:40: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |                                        ^
In file included from /usr/include/c++/14/ostream:1022:
/usr/include/c++/14/bits/ostream.tcc:307:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const char*)'
  307 |     operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
      |     ^~~~~~~~
/usr/include/c++/14/bits/ostream.tcc:307:5: note:   template argument deduction/substitution failed:
a.cc:70:40: note:   'std::_Setprecision' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   70 |         cout<setprecision(10)<<sqrt(dis)<<endl;
      |                                        ^
/usr/include/c++/14/ostream:671:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, const char*)'
  671 |     operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
      |