C++ program to enter a number and print it into words

Program

#include<iostream.h>
#include<conio.h>

void once(int a)
{
switch(a)
{
case 1: cout<<“One”;
break;
case 2: cout<<“Two”;
break;
case 3: cout<<“Three”;
break;
case 4: cout<<“Four”;
break;
case 5: cout<<“Five”;
break;
case 6: cout<<“Six”;
break;
case 7: cout<<“Seven”;
break;
case 8: cout<<“Eight”;
break;
case 9: cout<<“Nine”;
break;
}
}

int tens(int a,int b)
{
int flag=0;
switch(a)
{
case 1:
flag=1;
switch(b)
{
case 0: cout<<“Ten”;
break;
case 1: cout<<“Eleven”;
break;
case 2: cout<<“Twelve”;
break;
case 3: cout<<“Thirteen”;
break;
case 4: cout<<“Fourteen”;
break;
case 5: cout<<“Fifteen”;
break;
case 6: cout<<“Sixteen”;
break;
case 7: cout<<“Seventeen”;
break;
case 8: cout<<“Eighteen”;
break;
case 9: cout<<“Nineteen”;
break;
}
break;
case 2: cout<<“Twenty”;
break;
case 3: cout<<“Thirty”;
break;
case 4: cout<<“Fourty”;
break;
case 5: cout<<“Fifty”;
break;
case 6: cout<<“Sixty”;
break;
case 7: cout<<“Seventy”;
break;
case 8: cout<<“Eighty”;
break;
case 9: cout<<“Ninety”;
break;
}
return(flag);
}

void hundred(int a)
{
switch(a)
{
case 1: cout<<“One Hundred”;
break;
case 2: cout<<“Two Hundred”;
break;
case 3: cout<<“Three Hundred”;
break;
case 4: cout<<“Four Hundred”;
break;
case 5: cout<<“Five Hundred”;
break;
case 6: cout<<“Six Hundred”;
break;
case 7: cout<<“Seven Hundred”;
break;
case 8: cout<<“Eight Hundred”;
break;
case 9: cout<<“Nine Hundred”;
break;
}
}

void main()
{
clrscr();
int n,a[3],i=0,flag=0;
cout<<“Enter any number(max 3 digits):”;
cin>>n;

while(n!=0)
{
a[i++]=n%10;
n=n/10;
}

for(i=i-1;i>=0;–i)
{
if(i==0&&flag==0)
once(a[0]);
if(i==1)
flag=tens(a[1],a[0]);
if(i==2)
hundred(a[2]);
cout<<” “;
}
getch();
}