GENERATE OTP OR CAPTCHA CODE IN TURBO C++ FOR STUDENTS

//Generate the auto generated otp/ captcha code.
#include<iostream.h>
#include<conio.h>
#include<stdlib.h>
#include<string.h>
#define size 5
void main()
{
clrscr();
char code[size],ch,otp[size];
int n=0;
randomize();

while(n<size)
{
ch=(char)random(127);
if(ch>='a'&&ch<='z' || ch>='0'&&ch<='9' || ch>='A'&&ch<='Z')
{
code[n++]=ch;
}
}
code[n]='\0';
cout<<"\nCAPTCHA CODE GENERATED"<<endl;

textcolor(11);
cprintf(code);
cout<<endl;
cout<<"Enter the OTP to verify: ";
cin>>otp;

if(strcmp(code,otp)==0)
cout<<"\nOTP Verified....";
else
cout<<"\nOTP wrong....";
getch();
}