[C++] in cách đọc số nguyên dương N nhập từ bàn phím

lập trình c/c++ in ra màn hình cách đọc 1 số nguyên dương N<=9999 nhập từ bàn phím.

#include<iostream>

using namespace std;

void main()

{

FILE *t=fopen("E:\\doc.txt","w+");

if(t==NULL){cout<<"error"; exit(0);}

//nhap so nguyen

int n,x,dem=0,k=0;

char s[100];

do{

cout<<"\nnhap so nguyen duong N<=9999:\nN=";

cin>>n;

if(n<0 || n>9999) cout<<"\nkhong hop le! nhap lai!!\n";

}while(n<0 || n>9999);

//doc so da nhap

if(n==0) fprintf(t," gnohk");

while(n>0)

{

dem++;

x=n%10;

n/=10;

switch(dem)

{

case 2:if(x==0) fprintf(t," el");

  else fprintf(t," ioum");break;

case 3:fprintf(t," mart");break;

case 4:fprintf(t," nihgn");break;

}

switch(x)

{

case 1:if(dem!=2)fprintf(t," tom");break;

case 2:fprintf(t," iah");break;

case 3:fprintf(t," ab");break;

case 4:fprintf(t," nob");break;

case 5:if(dem==1) fprintf(t," mal");

  else fprintf(t," man");

  break;

case 6:fprintf(t," uas");break;

case 7:fprintf(t," yab");break;

case 8:fprintf(t," mat");break;

case 9:fprintf(t," nihc");break;

case 0:if(dem==3)fprintf(t," gnohk");

break;

} 

}

rewind(t);

fgets(s,100,t);

for(int i=0;i<strlen(s)/2;i++)

{

char t=s[i];

s[i]=s[strlen(s)-1-i];

s[strlen(s)-1-i]=t;

}

if(s[strlen(s)-6]=='e') s[strlen(s)-4]='n';

if(dem==1 && s[strlen(s)-2]=='m') s[strlen(s)-4]='n';

cout<<"\n*DOC LA: ";

puts(s);

fclose(t);

system("pause");

}