Thread: Array of strings & displaying them...

I'm new to C++ am having problems with this..it is a small part of an assignment. I need to store employee id numbers in an array of strings..in the format LNNN(letter, number, number,number) then I need to have a function to check each character of the string..to make sure it is the right format..then I need to display the contents of the array later in the program.. I've searched through the forums and have tried modifying my code..but it hasn't worked..Here is my code..

Code:

#include <iostream.h>
#include <ctype.h>
#include <string.h>

bool validID(char id []);

int main (void)
{
	char id[5];
	int count=0;
	const int MAX=3;

	for (count; count<MAX;count++)
	{
	cout<<"\n""Enter id: ";
	cin.getline(id,5);
	cin.ignore();

	if (validID(id))
		cout<<"Valid id."<<endl;
	else
	{
		cout<<"Invalid id."<<endl;
	}

		cout<<id[count];
	}
	return 0;		
}

bool validID (char id[])
{
int length;

length=strlen(id);
if (length>4)
return false;

for (int count=0; count<1; count++)
{
	if (!isalpha(id[count]))
		return false;
}

for (count=1; count<4; count++)
{
	if (!isdigit(id[count]))
		return false;
}

return true;
}

When I run this I get using a123, b123, c123 as input

Enter id: a123
valid id.
a->>should display id # a123

Enter id: b123
valid id.
1->>should display id # b123

Enter id:c123
Valid id.
2->>should display id # b123

What am I doing wrong?? Any help is greatly appreciated!

lms

Traveller,

Mabye this will be clearer as to what I want to do..If I input a123,b123,c123...then it should display it

Code:

#include <iostream.h>


bool validID(char id []);

int main (void)
{
	char id[5];
	int count=0;
	const int MAX=3;

	for(count=0;count <MAX; count++)
	{
	cout<<"Enter id: ";
	cin.getline(id,5);
	cin.ignore();
	}


	for (count=0;count<MAX;count++)
	{
	cout<<id[count]<<endl;
	}
	return 0;		
}

But when I run this piece..it outputs c 1 2..

When I want it to output a123, b123, c123.. so I'm obviously missing something..

Try using a multi. array like this:

#include <iostream.h>


bool validID(char id []);

int main (void)
{
char id[5][2]; //You'll have to change your other functions
int count=0;
const int MAX=3;

for(count=0;count <MAX; count++)
{
cout<<"Enter id: ";
cin.getline(id[][count],5);
cin.ignore();
cout<<endl;
}


for (count=0;count<MAX;count++)
{
for(int times = 0, times <4, times++)
cout<<id[times][count];
cout<<endl;
}
return 0;
}

Code:

#include <iostream.h>
#include <ctype.h>
#include <string.h>

bool validID(char []);

int main (void)
{
   char id[5];
   int count=0;
   const int MAX=3;
   char ids[MAX][5];
   int flag;

   for (count; count<MAX;count++)
   {
        //set flag to 0 for each new count
        flag = 0;

        //keep requesting user input until id is valid
        while(flag == 0)
         {
             cout<<"\n""Enter id: ";
             cin.getline(id,5);
             cin.ignore();//won't hurt, but not needed.  best  
                                //used before call to getline, not after. 
 
              //check if id is valid
              if (validID(id))
              {
                  cout<<"Valid id."<<endl;
                  ids[count]==id;
                  cout << ids[count]  << " saved to ids" << endl;
                  flag = 1;
               }
               else
               {
                    cout<<"Invalid id.  Try again."<<endl;
	}

	//cout<<id[count];
           }//end while
     }//end for
     return 0;		
}

bool validID (char id[])
{
    int length;

    length=strlen(id);
    if (length>4)
    return false;

   for (int count=0; count<1; count++)
  {
	if (!isalpha(id[count]))
		return false;
  }

   for (count=1; count<4; count++)
  {
	if (!isdigit(id[count]))
		return false;
  }

  return true;
}

Ok I ran this..and it is error checking correctly..but it prints out garbage for ids[count]..?..I'll continue to fiddle wqith it..thanks for the help though..any suggestions are welcome..

I got it!! For those who are interested...

Code:

#include <iostream.h>
#include <ctype.h>
#include <string.h>

const int MAX = 3;
bool validID(char [][10]);
void assignNames(char [][10]);
void main(void)
{
   char names[MAX][10];
  //get ids'
   for (int count = 0; count < MAX; count++)
   {
       cout << "Enter name: ";
       cin >> names[count];
   }
  //display ids
   for (count = 0; count < MAX; count++)
   {
       cout <<"Name " << count + 1 << 
       " is " << names[count] << "\n";
    }
   //ids valid or not
   for (count=0;count<MAX;count++)
	  {
	   if (validID(names))
		   cout<<"Valid."<<endl;
	   else
		   cout<<"Invalid"<<endl;
   }
	   for (count = 0; count < MAX; count++)
   {
       cout <<"\n""Name " << count + 1 << 
       " is " << names[count] << "\n";
    }

}


bool validID(char id[][10])
{
	
	int length,y;
	for (int x=0; x<MAX; x++)
	{
    length=strlen(id[x]);
    if (length>4)
    return false;
	}
   for ( x=0,y=0; y<1, y!='\0'; y++ )
   {
	    if (!isalpha(id[x][y]))
		return false;
  }

   for ( x=1,y=1; x<MAX, y<4; y++ )
  {
	if (!isdigit(id[x][y]))
		return false;
  }

return true;
}