informatika / Cinta Avrille X MIPA 5, C++ (gcc)

informatika / Cinta Avrille X MIPA 5

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//g++  7.4.0

#include <iostream>

int main()
{
     int npm, nilai;
    char nama [30] , matapelajaran [8], hurufmutu;
    //input data
cout<<"Masukan NPM : ";
    cin>>npm;
    cout<<"Masukan Nama Siswa : ";
    cin>>nama;
    cout<<"Masukan Mata Pelajaran : ";
    cin>>matakuliah;
    cout<<"Masukan Nilai Mata Pelajaran  : ";
    cin>>nilai;
    //menentukan indeks prestasi
    if (nilai<=45){
    hurufmutu='E';
        }else if(nilai>45 && nilai<=55){
        hurufmutu='D';
            }else if (nilai>55 && nilai<=65){
            hurufmutu='C';
                }else if (nilai>65 && nilai<=75){
                hurufmutu='B';
                    }else{
                    hurufmutu='A';
    }
    cout<<"=============================================================================="<<endl;
    cout<<"Siswa dengan npm "<<npm<<" atas nama "<<nama<<" pada mata pelajaran "<<matapelajaran<<" mendapatkan"<<endl;
    cout<<"nilai "<<hurufmutu<<endl;
    cout<<"=============================================================================="<<endl;
    return 0;
}

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Compilation time: 0.32 sec, absolute service time: 0,47 sec

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Error(s):

547741006/source.cpp: In function ‘int main()’:
547741006/source.cpp:10:1: error: ‘cout’ was not declared in this scope
 cout<<"Masukan NPM : ";
 ^~~~
547741006/source.cpp:10:1: note: suggested alternative:
In file included from 547741006/source.cpp:3:0:
/usr/include/c++/7/iostream:61:18: note:   ‘std::cout’
   extern ostream cout;  /// Linked to standard output
                  ^~~~
547741006/source.cpp:11:5: error: ‘cin’ was not declared in this scope
     cin>>npm;
     ^~~
547741006/source.cpp:11:5: note: suggested alternative:
In file included from 547741006/source.cpp:3:0:
/usr/include/c++/7/iostream:60:18: note:   ‘std::cin’
   extern istream cin;  /// Linked to standard input
                  ^~~
547741006/source.cpp:15:10: error: ‘matakuliah’ was not declared in this scope
     cin>>matakuliah;
          ^~~~~~~~~~
547741006/source.cpp:30:93: error: ‘endl’ was not declared in this scope
     cout<<"=============================================================================="<<endl;
                                                                                             ^~~~
547741006/source.cpp:30:93: note: suggested alternative:
In file included from /usr/include/c++/7/iostream:39:0,
                 from 547741006/source.cpp:3:
/usr/include/c++/7/ostream:590:5: note:   ‘std::endl’
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^~~~