C program, Assign negativeCntr with the number of negative values in the linked list, including the list head

Answer:

To get the count the negative values present in the linked list, the following steps:

In the main() function, at the last while loop

• Use an if condition to check whether the value in the linked list is less than zero.
  • If the value of the linked list is less than zero, then increment the negativeCntr by one.

The statements that need to be added at the /* Your solution goes here */ are:

             if (currObj->dataVal < 0)

         negativeCntr++;

Here is the program code with added statement highlighted in the bold letters is given as follows:

Program code screen shot:

Program code to copy:

#include <stdio.h>
#include <stdlib.h>

typedef struct IntNode_struct {
   int dataVal;
   struct IntNode_struct* nextNodePtr;
} IntNode;

// Constructor
void IntNode_Create(IntNode* thisNode, int dataInit, IntNode* nextLoc) {
   thisNode->dataVal = dataInit;
   thisNode->nextNodePtr = nextLoc;
}

/* Insert newNode after node.
Before: thisNode -- next
After: thisNode -- newNode -- next
*/
void IntNode_InsertAfter(IntNode* thisNode, IntNode* newNode) {
   IntNode* tmpNext = NULL;

   tmpNext = thisNode->nextNodePtr; // Remember next
   thisNode->nextNodePtr = newNode; // this -- new -- ?
   newNode->nextNodePtr = tmpNext; // this -- new -- next
}

// Grab location pointed by nextNodePtr
IntNode* IntNode_GetNext(IntNode* thisNode) {
   return thisNode->nextNodePtr;
}

int IntNode_GetDataVal(IntNode* thisNode) {
   return thisNode->dataVal;
}

int main(void)
{
   IntNode* headObj = NULL; // Create intNode objects
   IntNode* currObj = NULL;
   IntNode* lastObj = NULL;
   int i; // Loop index
   int negativeCntr;

   negativeCntr = 0;

   headObj = (IntNode*)malloc(sizeof(IntNode)); // Front of nodes list
   IntNode_Create(headObj, -1, NULL);
   lastObj = headObj;

   for (i = 0; i < 10; ++i) { // Append 10 rand nums
       currObj = (IntNode*)malloc(sizeof(IntNode));
       IntNode_Create(currObj, (rand() % 21) - 10, NULL);
       IntNode_InsertAfter(lastObj, currObj); // Append curr
       lastObj = currObj; // Curr is the new last item
   }

   currObj = headObj; // Print the list
   while (currObj != NULL) {
       printf("%d, ", IntNode_GetDataVal(currObj));
       currObj = IntNode_GetNext(currObj);
   }
   printf("\n");

   currObj = headObj; // Count number of negative numbers
   while (currObj != NULL) {
       if (currObj->dataVal < 0)
           negativeCntr++;
       currObj = IntNode_GetNext(currObj);
   }
   printf("Number of negatives: %d\n", negativeCntr);  
   return 0;
}

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