Digital Stop-Watch Program

Digital Stop watch in C++ is not very difficult using libraries and build in functions which make this program so easy to create and understand even new beginner programmers can also understand it .We create this program as easy as possible if you have any query comment below . you can also convert it to simple c .

#include<conio.h>
#include<process.h>
#include<iostream>
#include<dos.h>
using namespace std;

int h=0,m=0,s=0,ms=0; // Hours mins sec and microseconds
char ch='p'; //For Menu to start and pause stop watch

int main()
{
 void watch(); // Build in Function of watch
 watch();

  while(1)
 {
  if(kbhit())
   ch=getch();
  if(ch=='s'||ch=='S')
   break;
  if(ch=='e'||ch=='E')
   exit(0);
 }

  while(1)
 {
  watch();
  

   if(kbhit())
   ch=getch();

   if(ch=='r'||ch=='R')
  {
   h=m=s=ms=0;
   watch();

    while(1)
   {
    if(kbhit())
     ch=getch();
    if(ch=='s'||ch=='S')
     break;
    if(ch=='e'||ch=='E')
     exit(0);
   }
  }
  else
   if(ch=='p'||ch=='P')
    while(1)
    {
     if(kbhit())
      ch=getch();
     if(ch=='s'||ch=='S')
      break;
     if(ch=='e'||ch=='E')
      exit(0);
     if(ch=='r'||ch=='R')
     {
      ch='c';
      h=m=s=ms=0;
      watch();
     }
    }
   else
    if(ch=='e'||ch=='E')
     exit(0);

   if(ms!=99)
   ms++;
  else
  {
   ms=0;
   if(s!=59)
    s++;
   else
   {
    s=0;
    if(m!=59)
     m++;
    else
    {
     m=0;
     h++;
    }
   }
  }
 }
}


int watch()
{
 system("cls");
 cout<<"\n\n\n\n\n\t\t\t\t-------------";
 cout<<"\n\t\t\t\t| Stopwatch |";
 cout<<"\n\t\t\t\t-------------";
 cout<<"\n\n\t\t\t\t  "<<h<<":"<<m<<":"<<s<<":"<<ms;

    cout<<"\n\t\t\t\t\t\t\t---------";
  cout<<"\n\t\t\t\t\t\t\t Menu";
 cout<<"\n\t\t\t\t\t\t\t---------";
 cout<<"\n\t\t\t\t\t\t\ts -> Start";
 cout<<"\n\t\t\t\t\t\t\tp -> Stop";
 cout<<"\n\t\t\t\t\t\t\tr -> Reset";
 cout<<"\n\t\t\t\t\t\t\te -> Exit";
 
}

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