Run id: 112413

Main.cc: In function 'int main()':
Main.cc:15:19: error: no matching function for call to 'abs()'
             x=abs()a[i]-a[j];
                   ^
In file included from /usr/include/c++/5/cstdlib:72:0,
                 from /usr/include/c++/5/ext/string_conversions.h:41,
                 from /usr/include/c++/5/bits/basic_string.h:5249,
                 from /usr/include/c++/5/string:52,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from Main.cc:1:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^
/usr/include/stdlib.h:774:12: note:   candidate expects 1 argument, 0 provided
In file included from Main.cc:5:0:
/usr/include/c++/5/cmath:99:5: note: candidate: template constexpr typename __gnu_cxx::__enable_if::__value, double>::__type std::abs(_Tp)
     abs(_Tp __x)
     ^
/usr/include/c++/5/cmath:99:5: note:   template argument deduction/substitution failed:
Main.cc:15:19: note:   candidate expects 1 argument, 0 provided
             x=abs()a[i]-a[j];
                   ^
In file included from Main.cc:5:0:
/usr/include/c++/5/cmath:91:3: note: candidate: constexpr long double std::abs(long double)
   abs(long double __x)
   ^
/usr/include/c++/5/cmath:91:3: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/5/cmath:87:3: note: candidate: constexpr float std::abs(float)
   abs(float __x)
   ^
/usr/include/c++/5/cmath:87:3: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/5/cmath:81:3: note: candidate: constexpr double std::abs(double)
   abs(double __x)
   ^
/usr/include/c++/5/cmath:81:3: note:   candidate expects 1 argument, 0 provided
In file included from /usr/include/c++/5/ext/string_conversions.h:41:0,
                 from /usr/include/c++/5/bits/basic_string.h:5249,
                 from /usr/include/c++/5/string:52,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from Main.cc:1:
/usr/include/c++/5/cstdlib:174:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^
/usr/include/c++/5/cstdlib:174:3: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/5/cstdlib:166:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^
/usr/include/c++/5/cstdlib:166:3: note:   candidate expects 1 argument, 0 provided