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#include <iostream>
int sum(int a, int b);
int main(){
int a = 2, b = 3, c, d;
с = sum(a, b);
cin >> d;
cout << sum(c, d);
return 0;
}
int sum(int a, int b){
return (a + b);
}

prog.cpp:5:1: error: stray '\321' in program
 с = sum(a, b);
 ^
prog.cpp:5:1: error: stray '\201' in program
prog.cpp: In function 'int main()':
prog.cpp:5:4: error: expected primary-expression before '=' token
 с = sum(a, b);
    ^
prog.cpp:6:1: error: 'cin' was not declared in this scope
 cin >> d;
 ^
prog.cpp:6:1: note: suggested alternative:
In file included from prog.cpp:1:0:
/usr/include/c++/4.9/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
prog.cpp:7:1: error: 'cout' was not declared in this scope
 cout << sum(c, d);
 ^
prog.cpp:7:1: note: suggested alternative:
In file included from prog.cpp:1:0:
/usr/include/c++/4.9/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^

Standard output is empty