Question

In C++ write validation function

A company requires  that a valid customer numbers must be in the format of LLLNNNN ( three upper case letters followed by four digits). Please write a function called isValid that takes a string as an argument and returns  if the string is a valid customer number.

Answer 1

source code:

*******************************************************************************/
#include <cctype>
#include <iostream>
#include <cstring>

using namespace std;
bool isValid(string str);
int main()
{
string str;
cout<<"Enter Customer number : ";
cin>>str;
  
if(isValid(str))
{
cout<<"Customer number is valid";
return 0;
}

cout<<"Customer number is invalid";
return 0;
}

bool isValid(string str)
{
if(str.length()==7)
{
if(isupper(str[0]) &&isupper(str[1])&&isupper(str[2])&&isdigit(str[3])&&
isdigit(str[4])&&isdigit(str[5])&&isdigit(str[6]))
return true;
else{
return false;
}
}
else{
return false;
}
}

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