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// Сложение 2 целых чисел
#include <iostream>
 
int main()
{
int integer1, integer2, sum;
 
cout << "Введите первое целое число\n";
cin >> integer1;
 
cout << "Введите второе целое число\n";
cin >> integer2;
 
sum = integer1 + integer2;
cout << "Сумма равна " << sum << endl;
return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:8:1: error: ‘cout’ was not declared in this scope
prog.cpp:8:1: note: suggested alternative:
In file included from prog.cpp:2:0:
/usr/include/c++/4.7/iostream:62:18: note:   ‘std::cout’
prog.cpp:9:1: error: ‘cin’ was not declared in this scope
prog.cpp:9:1: note: suggested alternative:
In file included from prog.cpp:2:0:
/usr/include/c++/4.7/iostream:61:18: note:   ‘std::cin’
prog.cpp:15:44: error: ‘endl’ was not declared in this scope
prog.cpp:15:44: note: suggested alternative:
In file included from /usr/include/c++/4.7/iostream:40:0,
                 from prog.cpp:2:
/usr/include/c++/4.7/ostream:562:5: note:   ‘std::endl’

Standard output is empty