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#include <iostream>
#include <cassert>
#
 
using namespace std;
 
void Add(int num1, int den1, int num2, int den2, int & result_num, int & result_den)
{
	int add_num, add_den;
	result_den = lcm(den1, den2);
	result_num = num1*den2 + den1*num2;
	Reduction(result_num, result_den, add_num, add_den);
}
 
void Sub(int num1, int den1, int num2, int den2, int& result_num, int& result_den){
 
	int sub_num, sub_den;
	result_den = lcm(den1, den2);
	result_num = num1*den2 - den1*num2;
	Reduction(result_num, result_den, sub_num, sub_den);
}
 
void Mpy(int num1, int den1, int num2, int den2, int& result_num, int& result_den){
 
 
	int mpy_num, mpy_den;
	result_num = num1*num2;
	result_den = den1*den2;
	Reduction(result_num, result_den, mpy_num, mpy_den);
}
 
void Div(int num1, int den1, int num2, int den2, int result_num, int result_den){
 
	int div_num, div_den;
	result_num = num1*den2;
	result_den = num2*den1;
	Reduction(result_num, result_den, div_num, div_den);
}
 
int lcm(int m, int n){
 
 
	int m1 = m / gcd(n, m);  // 최소공배수 통분했을때 나오는 최대공약수 제외한 나머지 값
	int n1 = n / gcd(n, m);
 
	return gcd(n, m) * m1 * n1;  // 최대 공약수 랑 통분했을 시 나오는 수들의 곱셈
}
 
int gcd(int n, int m){
 
    assert((n > 0) && (m > 0));
	if (n < m)
	{
		int temp = n;
		n = m;
		m = temp;
 
		return gcd(n%m, n);
	}
 
	return gcd(n%m, m);
 
}
 
void Reduction(int num, int den, int& result_num, int& result_den)  //reduction함수의 첫번째 두번째 인자는 사칙연산의 결과의 분자/분모이다.
{
	gcd(num, den);
 
	result_num = result_num / gcd(num, den);
 
	result_den = result_den / gcd(num, den);
 
}
 
int main()
{
 
	int a, b, c, d;
	assert((b > 0) && (d > 0));
	int resultNum, resultDen;
 
	cout << "분자/분모를 차례대로 입력하시오 :";
	cin >> a >> b >> c >> d;
 
 
	cout << "(" << a << "/" << b << ")+" << "(" << c << "/" << d << ")=";
 
	Add(a, b, c, d, resultNum, resultDen);
 
	cout << "(" << a << "/" << b << ")-" << "(" << c << "/" << d << ")=";
 
	Sub(a, b, c, d, resultNum, resultDen);
 
	cout << "(" << a << "/" << b << ")*" << "(" << c << "/" << d << ")=";
 
    Mpy(a, b, c, d, resultNum, resultDen);
 
	cout << "(" << a << "/" << b << ")/" << "(" << c << "/" << d << ")=";
 
    Div(a, b, c, d, resultNum, resultDen);
 
 
	return 0;
}
 

prog.cpp: In function 'void Add(int, int, int, int, int&, int&)':
prog.cpp:10:29: error: 'lcm' was not declared in this scope
  result_den = lcm(den1, den2);
                             ^
prog.cpp:12:52: error: 'Reduction' was not declared in this scope
  Reduction(result_num, result_den, add_num, add_den);
                                                    ^
prog.cpp: In function 'void Sub(int, int, int, int, int&, int&)':
prog.cpp:18:29: error: 'lcm' was not declared in this scope
  result_den = lcm(den1, den2);
                             ^
prog.cpp:20:52: error: 'Reduction' was not declared in this scope
  Reduction(result_num, result_den, sub_num, sub_den);
                                                    ^
prog.cpp: In function 'void Mpy(int, int, int, int, int&, int&)':
prog.cpp:29:52: error: 'Reduction' was not declared in this scope
  Reduction(result_num, result_den, mpy_num, mpy_den);
                                                    ^
prog.cpp: In function 'void Div(int, int, int, int, int, int)':
prog.cpp:37:52: error: 'Reduction' was not declared in this scope
  Reduction(result_num, result_den, div_num, div_den);
                                                    ^
prog.cpp: In function 'int lcm(int, int)':
prog.cpp:43:23: error: 'gcd' was not declared in this scope
  int m1 = m / gcd(n, m);  // 최소공배수 통분했을때 나오는 최대공약수 제외한 나머지 값
                       ^

Standard output is empty