Thread: printing with linked list problem

Any help on this print function using a linked list. I am getting the print statement coming up twice.

Code:

#include "mystuff.h"                                                                             

void countchar (NODE* pList)
 
{
 // local declarations
  int a;
  int w = w;
  int sum = 0;
  NODE* pWalker;
  pWalker = pList;
  int testEOF;
    
 // functions
 while (testEOF != EOF)
 { printf("Enter a char to be counted for in the linked list: <EOF> to stop ");
   testEOF = scanf("%c", &a);
   while (pWalker)
   {
    w = (pWalker->data.key);
    if (w == a)
    sum++;
    pWalker = pWalker->link;
   }
  printf("The number of %c's in the linked list is: %d\n", a, sum);

 }
  return;
}

The output: I entered an 'a' and it printed the print statement and then I hit ctrl+d and it printed again. Not sure what Is going on.

Code:

[n00611323@osprey a7]$ ./a.out data
b. The Linked list of chars reversed is: t d i m h c S n o r e m a C 
c. The total number of vowels in the linked list is: 4
Enter a char to be counted for in the linked list: <EOF> to stop a
The number of a's in the linked list is: 1
Enter a char to be counted for in the linked list: <EOF> to stop The number of 
's in the linked list is: 1
Enter a char to be counted for in the linked list: <EOF> to stop The number of 
's in the linked list is: 1

After the EOF is entered, you need a break from the loop, immediately.

I added the break but the code still gives an odd output

Code:

#include "mystuff.h"

void countchar (NODE* pList)

{
 // local declarations
  int a;
  int w = w;
  int sum = 0;
  NODE* pWalker;
  pWalker = pList;
  int testEOF;

 // functions
 while(testEOF != EOF)
 { printf("Enter a char to be counted for in the linked list: <EOF> to stop ");
   testEOF = scanf("%c", &a);
   if (testEOF == EOF)
   break;
   while (pWalker)
   {
    w = (pWalker->data.key);
    if (w == a)
    sum++;
    pWalker = pWalker->link;
   }
  printf("The number of %c's in the linked list is: %d\n", a, sum);

 }
  return;
}

Output with 'o' entered and then ctrl+d for EOF

Code:

[n00611323@osprey a7]$ ./a.out data
b. The Linked list of chars reversed is: t d i m h c S n o r e m a C 
c. The total number of vowels in the linked list is: 4
Enter a char to be counted for in the linked list: <EOF> to stop o
The number of o's in the linked list is: 1
Enter a char to be counted for in the linked list: <EOF> to stop The number of 
's in the linked list is: 1
Enter a char to be counted for in the linked list: <EOF> to stop [n00611323@osprey a7]$

I should have put this in the first post but this is the purpose of the function.

It is supposed to read an input from the user and then scan the linked list for it and it will print the number of times that value is in the linked list. It will repeat this any number of times until the user enters ctrl-d, EOF.

"
Prior to each running of function d (until the user enters ctrl-d), the program should
continuously prompt the user for the particular char
to be counted. "

I tried this but its not working right.

Code:

#include "mystuff.h"

void countchar (NODE* pList)
{
// local declarations
int a;
int w = w;
int sum = 0;
NODE* pWalker;
pWalker = pList;


// functions
printf("Enter a char to be counted for in the linked list: <EOF> to stop\n");
while ((a = getc(stdin)) != EOF)
{
pWalker = pList;
sum = 0;
while (pWalker)
{
w = (pWalker->data.key);
if (w == a)
sum++;
pWalker = pWalker->link;
}
printf("The number of %c's in the linked list is: %d\n", a, sum);
printf("Enter a char to be counted for in the linked list: <EOF> to stop");
}
}

I see. I ended up just adding a second char in my scanf statement so it would pick up the return character so now its basically discarded and is not search for or used in my printf statement.

Before hand it took the return char and tried to search for it finding nothing and it would print it found nothing.