Question

Hello I am taking an Introduction to Programming class and I need help coming up with a Psuedocode for an algorithm. Here is the assignment:

1. Use an array to prompt the user to enter a credit card account number

2. Use the sequential search algorithm to locate the credit card number entered by the user

3. If the credit card number is NOT in the array, display a message indicating the number is invalid

4. If the credit card number is in the array, display a message indicating the credit card number is valid

Create a psuedocode based on the programs needs.

Thanks!

Answer 1

#include<iostream>
using namespace std;
//method to search element s in array a
//if found it return its index
//other wise -1
int sequential_search(int a[],int n,int s)
{
int i=0;
while(i<n)
{
  if(a[i]==s)return i;//returning index
i++;
}
return -1;//if not found
}

int main()
{
int n;//reading input...
cout<<"Enter how many details you want to enter:";
cin>>n;

int credit_cards[n];
cout<<"Enter "<<n<<" credit card numbers:";
int i=0;
while(i<n)
{
  cin>>credit_cards[i];
  i++;
}

int s;
cout<<"Enter element to search:";
cin>>s;
int l=sequential_search(credit_cards,n,s);
if(l!=-1)
{
  cout<<"Valid.."<<endl;
}
else cout<<"Not valid\n";


}

output:

Enter how many details you want to enter:3
Enter 3 credit card numbers:123 432 129
Enter element to search:432
Valid..

Process exited normally.
Press any key to continue . . .