اريد المساعدة في هذا البرنامج وتصحيح الكود

# include <iostream.h>

# include <stdio>

int Add (int x, int y)

{return x+y;}

int Sub (int x, int y)

{return x-y;}

int multi (int x, int y)

{return x*y;}

int fact (int x)

for (int i=1;<=x;i++)

{return fact=fact*i;}

int swap (int x, int y) اي ان a=b

x=y;

{return x=y;}

void main()

{

cout<<"Programm Menu\n\n";

cout<<"1- Add tow number\n";

cout<<"2- Sub tow number\n";

cout<<"3- multi tow number\n";

cout<<"4- factorial\n";

cout<<"5- swap\n";

cout<<"6- Exit\n\n";

cout<<"choes number from 1_6\n";

int a,b,result;

cout<<"Enter The First Number\n";

cin>>a;

cout<<"Enter The Second Number\n";

cin>>b;

result=Add(ab);

cout<<"Add result="<<result;

result=Sub (a , b ) ;

cout<<"Sub result="<<result;

result=Multi (a, b ) ;

cout<<"Multi result="<<result;

for (int i=1 ; i<=a; i++)

result=fact*i;

cout<<"Factorial="<<result;

result= (a= b ) ;

cout<<"a="<<a<<"b="<<b;

getchar();}