#include <iostream.h>
int add (int x , int y)
{
   
    cout << "In Add() , received " << x << " and " << y << "\n";
    return (x+y);
}

int main()
{
    cout << "I'm in main()!\n";
    int a ,b,c;
    cout << "Enter two numbers: ";
    cin >> a;
    cin >> b;
    cout << "\nCalling add()\n";
    c=add(a,b);
    cout << "\nBack in main().\n";
    cout << "c was set to" << c;
    cout << "\nExiting..\n\n";
    return 0;
}

정말 간단하죠?-_-;;
이틀전부터 공부한지라..-_-;;
헤더파일을 conio.h로 바꾸고
main() 제일 아래부분에 getch()문을 삽입해도 안되네요
이런 에러가 나요ㅠ_ㅠ

Borland C++ 5.5.1 for Win32 Copyright (c) 1993, 2000 Borland
func.cpp:
Error E2451 func.cpp 5: Undefined symbol 'cout' in function add(int,int)
Error E2451 func.cpp 11: Undefined symbol 'cout' in function main()
Error E2451 func.cpp 14: Undefined symbol 'cin' in function main()
Warning W8066 func.cpp 22: Unreachable code in function main()
Warning W8004 func.cpp 23: 'c' is assigned a value that is never used in function main()
*** 3 errors in Compile ***

제발 설명좀 ㅠ_ㅠ